Due Diligence Declaration: What Courts Require for Alternative Service
When you can’t find a defendant to serve them personally, courts require proof that you tried everything reasonable before allowing alternative service methods like publication. This proof comes in the form of a due diligence declaration—a sworn statement documenting every search, every database, every address visited, and every attempt made. Get it wrong, and your motion gets denied. Get it really wrong, and your entire case could be dismissed for improper service. This comprehensive guide shows you exactly what courts require.
📌 Key Takeaways
- Due diligence declarations must document ALL search efforts before alternative service
- Courts require multiple service attempts at different times and days
- Professional skip tracing reports strengthen declarations significantly
- Specific documentation (dates, times, addresses, results) is mandatory
- Requirements vary by state—know your jurisdiction’s standards
- Insufficient due diligence can invalidate service and derail your case
- Recent efforts matter—searches should be within 30-60 days
📑 Table of Contents
- What Is a Due Diligence Declaration?
- When Is It Required?
- Core Documentation Requirements
- Required Search Types
- Service Attempt Documentation
- State-Specific Requirements
- Professional Skip Tracing
- Writing the Declaration
- Sample Declaration Language
- Common Mistakes to Avoid
- Surviving Court Scrutiny
- After Alternative Service
- Frequently Asked Questions
📋 What Is a Due Diligence Declaration?
A due diligence declaration (also called a declaration of diligent search, affidavit of due diligence, or declaration of mailing) is a sworn legal document submitted to the court when requesting permission to use alternative service methods. It proves to the court that you made reasonable, good-faith efforts to locate and personally serve the defendant before resorting to methods like service by publication.
The Legal Foundation
Due process requires that defendants receive actual notice of legal proceedings against them whenever possible. Personal service—handing documents directly to the defendant—provides the highest level of assurance that notice was received. Alternative service methods like publication provide constructive notice but are considered less reliable.
Courts protect defendants’ due process rights by requiring plaintiffs to exhaust reasonable efforts to achieve personal service before allowing alternatives. The due diligence declaration is your proof that you met this burden.
What Courts Are Looking For
When reviewing your declaration, judges and court clerks evaluate:
- Comprehensiveness: Did you search multiple sources and try multiple approaches?
- Reasonableness: Were your efforts proportionate to the case and circumstances?
- Good faith: Did you genuinely try to find the defendant, or just go through motions?
- Documentation: Can you prove what you did with specific dates, times, and results?
- Recency: Are your efforts current enough to reflect the defendant’s present situation?
💡 The “Reasonably Calculated” Standard
Courts apply a “reasonably calculated to give actual notice” standard. Your efforts must be reasonably calculated to find the defendant given what you knew about them. More information about the defendant means higher expectations for your search. If you know they work at a specific company, you should attempt service there. If you have relatives’ addresses, you should check those leads.
⚖️ When Is a Due Diligence Declaration Required?
You need a due diligence declaration whenever you’re requesting the court’s permission to use alternative service methods:
Alternative Service Methods Requiring Declaration
- Service by publication: Publishing notice in a newspaper of general circulation
- Posting service: Posting documents on the defendant’s door (nail and mail)
- Service by mail: When personal service isn’t possible and mail is authorized
- Substitute service: In some jurisdictions, leaving with another person at residence/workplace
- Electronic service: Service via email or social media (where permitted)
- Service on Secretary of State: For corporations that can’t be located
When Declaration Is NOT Required
- Successful personal service (defendant was found and served)
- Substitute service that doesn’t require court approval (varies by state)
- Agreed-upon service methods in contracts with service of process clauses
- Service on registered agents for business entities
📝 Core Documentation Requirements
Every due diligence declaration must include specific categories of information. Missing any category can result in denial of your motion.
Search Documentation
Every database searched, public record checked, and investigation method used—with dates and results for each.
Addresses Investigated
Every address identified as potential defendant location, how it was found, and what verification was attempted.
Service Attempts
Each attempt at personal service with date, time, address, and what happened (no answer, wrong person, etc.).
Third-Party Contacts
Attempts to locate defendant through relatives, employers, neighbors, or other known contacts.
Communication Attempts
Phone calls, emails, social media messages, or other attempts to make contact.
Professional Reports
Skip tracing reports, investigator findings, or other professional search results (attach as exhibits).
The Specificity Requirement
Vague statements like “I searched the internet” or “I tried to find the defendant” are insufficient. Courts require specific details:
❌ Insufficient
- “I searched online databases”
- “I went to defendant’s address”
- “I tried calling the defendant”
- “I checked public records”
- “I asked around about defendant”
✅ Sufficient
- “On [date], I searched LexisNexis Accurint, which returned…”
- “On [date] at [time], I visited 123 Main St and observed…”
- “On [date], I called (555) 123-4567 and the number was…”
- “On [date], I searched Los Angeles County property records…”
- “On [date], I spoke with Jane Doe, defendant’s sister, who stated…”
🔎 Required Search Types
Courts expect you to search multiple categories of records and sources. The more sources you check, the stronger your declaration.
Public Records Searches
| Record Type | What It Shows | Where to Search |
|---|---|---|
| Property/Real Estate | Owned properties, mailing addresses for tax bills | County assessor, recorder |
| Court Records | Addresses from other lawsuits, filings | County clerk, state courts, PACER |
| Voter Registration | Registered address | County registrar, state database |
| Marriage/Divorce | Spouse information, addresses from filings | County clerk, vital records |
| Business Filings | Registered agent, officer addresses | Secretary of State |
| Professional Licenses | Address on file with licensing board | State licensing agencies |
| Vehicle Registration | Registered owner address | DMV (with proper authorization) |
| UCC Filings | Secured party/debtor addresses | Secretary of State |
Database Searches
Professional databases provide information not available through free public searches:
- Credit header data: Addresses from credit applications (requires permissible purpose)
- Utility records: Electric, gas, water, cable connection addresses
- People search databases: Aggregated public records with address history
- Social Security traces: Addresses associated with SSN
Social Media and Online Investigation
- Facebook, Instagram, LinkedIn, Twitter profile searches
- Check-ins, tagged locations, employment information
- Google searches for name + location, employer, associates
- Online directories and phone lookup services
Third-Party Inquiries
- Contact with known relatives
- Previous employers (within legal bounds)
- Neighbors at last known address
- Former landlords
- Professional associations
⚠️ Document Everything—Even Dead Ends
A search that returns no results is still valuable documentation. “On January 15, 2026, I searched Orange County property records for [defendant name] and found no property ownership” shows you checked. Courts want to see that you looked—not just that you found.
🚪 Service Attempt Documentation
Documentation of actual service attempts is often the most scrutinized part of your declaration. Courts want to see genuine efforts at personal service.
Minimum Attempt Requirements
| Jurisdiction | Minimum Attempts | Timing Requirements |
|---|---|---|
| California | 3 attempts | Different times, different days; at least one weekday after 6 PM or weekend |
| New York | 3 attempts | Different times of day on different days |
| Texas | 2-3 attempts | Varies by county; reasonable efforts standard |
| Florida | 2 attempts | Different times/days; diligent search required |
| Illinois | 3 attempts | Reasonable times on different dates |
| Federal Courts | No fixed number | Reasonable under the circumstances |
What Each Attempt Must Document
✅ Service Attempt Checklist
- Date of attempt (month, day, year)
- Time of attempt (specific time, not “morning” or “evening”)
- Address where service was attempted
- Who attempted service (you, process server, investigator)
- What occurred (no answer, wrong address, spoke with person who said…)
- Observations about the property (lights on/off, car in driveway, etc.)
- Weather conditions if relevant (couldn’t access due to flooding, etc.)
- Any information obtained from neighbors or others present
Timing Strategy for Attempts
Courts look for attempts at varied times to maximize the chance of finding the defendant home:
- Attempt 1: Weekday business hours (to confirm address/see if someone’s home)
- Attempt 2: Weekday evening after 6:00 PM (when workers are typically home)
- Attempt 3: Weekend morning or afternoon (catches those with non-standard work schedules)
- Attempt 4 (if needed): Different day/time pattern
Workplace Service Attempts
If you know where the defendant works, courts may expect service attempts there:
- Document how you learned the workplace information
- Note the attempt date, time, and what occurred
- If employer refused to allow service, document who you spoke with
- If defendant no longer works there, document who told you and when
🗺️ State-Specific Requirements
Due diligence standards vary significantly by state. Here are requirements for major jurisdictions:
California (CCP § 415.50)
California has detailed requirements for service by publication:
- Declaration must show defendant “cannot with reasonable diligence be served in another manner”
- At least 3 service attempts at residence
- Attempts must include times when defendant would reasonably be expected to be home
- Must search: DMV, voter registration, assessor records, directory assistance, postal service
- Must check with relatives, friends, employer if known
New York (CPLR 316)
New York requires:
- Affidavit showing service “cannot be made with due diligence” by other methods
- Multiple attempts at last known residence
- Inquiry at last known place of business
- Check of telephone directory, post office, and other sources
- Motion must specify the publication to be used
Texas (TRCP 109-117)
Texas requires:
- Citation by publication requires affidavit that defendant’s residence is unknown
- Must state efforts made to find defendant
- Searches of property records, voter rolls, and other public records expected
- Professional skip trace often required for court approval
Florida (Fla. Stat. § 49.041)
Florida requires:
- Sworn statement of diligent search and inquiry
- Must detail all efforts to locate defendant
- Include searches of phone directories, city directories, and public records
- Military status affidavit often required (SCRA compliance)
💼 Professional Skip Tracing for Due Diligence
Professional skip tracing significantly strengthens due diligence declarations by providing documented searches of databases unavailable to the general public.
What Professional Skip Traces Provide
- Credit header searches: Most current addresses from credit activity
- Utility records: Recent utility connections showing current residence
- Comprehensive address history: All known addresses with dates
- Phone numbers: Current and historical phone numbers
- Employment information: Employer names and addresses when reported
- Relative/associate information: Potential leads for contact
- Formal report: Documentation courts recognize as professional search
How to Use Skip Trace Reports in Declarations
- Attach the full skip trace report as an exhibit to your declaration
- Summarize the key findings in your declaration narrative
- Explain what you did with the information (attempted service at addresses found, etc.)
- Note the date of the search and company that performed it
✅ Why Professional Searches Help
Courts recognize that professional skip tracers access databases requiring licensing and permissible purpose compliance. A professional report showing “no current address found” after searching credit headers, utilities, DMV, and other regulated sources carries significant weight—more than someone simply saying they “Googled” the defendant.
✍️ Writing the Declaration
A well-organized declaration makes it easy for courts to find the information they need. Follow this structure:
Declaration Structure
Caption and Introduction
Case caption, your name, relationship to case, and statement that you’re making the declaration under penalty of perjury.
Background Information
What you knew about defendant at case start: name, last known address, any other identifying information.
Public Records Searches
Each public record source searched, with dates and results. Organize by category or chronologically.
Database and Professional Searches
Skip tracing, people search databases, and other professional investigations. Reference attached reports.
Third-Party Contacts
Attempts to locate defendant through relatives, employers, neighbors, or associates.
Service Attempts
Each service attempt with date, time, address, and result. Most detailed section.
Conclusion
Statement that defendant cannot be served with reasonable diligence by any other method, request for alternative service.
Signature and Verification
Signature under penalty of perjury with date and location.
📄 Sample Declaration Language
Here is sample language for key sections of your declaration. Adapt to your specific facts and jurisdiction.
📝 Sample Introduction
I, [Your Name], declare as follows:
1. I am the plaintiff in the above-entitled action [or: I am employed by the law firm representing plaintiff]. I have personal knowledge of the facts stated herein, and if called as a witness, I could and would competently testify thereto.
2. Despite diligent efforts as described below, I have been unable to locate defendant [Defendant Name] for personal service of the summons and complaint in this matter.
📝 Sample Search Documentation
3. On January 10, , I searched the Los Angeles County Assessor’s records for real property owned by defendant. No property was found in defendant’s name.
4. On January 10, , I searched the California Secretary of State business entity records for any business filings listing defendant as an officer, director, or registered agent. No records were found.
5. On January 11, , I retained People Locator Skip Tracing to conduct a comprehensive skip trace. The search included credit header data, utility records, and other proprietary databases. A copy of the report is attached as Exhibit A. The search identified a possible address at 456 Oak Avenue, Anytown, CA 90000.
📝 Sample Service Attempt Documentation
8. On January 15, , at approximately 10:30 AM, I attempted personal service at 456 Oak Avenue, Anytown, CA 90000. No one answered the door. I observed that the residence appeared occupied—there was a vehicle in the driveway and lights on inside.
9. On January 17, , at approximately 7:15 PM, I returned to 456 Oak Avenue for a second service attempt. A woman answered the door and identified herself as defendant’s sister. She stated defendant had not lived at that address for approximately six months and she did not know defendant’s current address.
10. On January 20, (Saturday), at approximately 11:00 AM, I attempted service at the address listed in voter registration records, 789 Pine Street, Anytown, CA 90001. A man who identified himself as the current tenant stated he had lived there for two years and did not know anyone named [Defendant Name].
📝 Sample Conclusion
15. Based on the foregoing, I have exercised reasonable diligence in attempting to locate and serve defendant [Defendant Name], but have been unable to do so. Defendant’s current residence and whereabouts remain unknown despite my diligent efforts to locate defendant.
16. I respectfully request that the Court authorize service of the summons and complaint on defendant by publication in [Newspaper Name], a newspaper of general circulation in [County], California.
I declare under penalty of perjury under the laws of the State of California that the foregoing is true and correct.
Executed on [Date], at [City], California.
_______________________
[Your Name]
❌ Common Mistakes to Avoid
These mistakes frequently result in denied motions for alternative service:
Insufficient Specificity
- Mistake: “I searched various databases and public records”
- Fix: List each database by name with dates and results
Missing Dates and Times
- Mistake: “I attempted service at defendant’s home several times”
- Fix: “On [date] at [time], I attempted service at [address]…”
Inadequate Service Attempts
- Mistake: Three attempts all on weekday mornings
- Fix: Vary times—include evening and weekend attempts
Stale Information
- Mistake: Relying on searches conducted 6 months ago
- Fix: Conduct fresh searches within 30-60 days of motion
Failing to Follow Up on Leads
- Mistake: Skip trace found possible employer but no service attempt there
- Fix: Attempt service at every viable address identified
Missing Required Searches
- Mistake: Only searching free online databases
- Fix: Include public records, professional skip trace, and physical attempts
🚫 Don’t Exaggerate or Fabricate
Declarations are made under penalty of perjury. Claiming you made service attempts you didn’t make, or searches you didn’t conduct, is perjury. Courts may verify your statements, and opposing counsel may challenge them. Fabrication can result in sanctions, case dismissal, and even criminal charges.
⚖️ Surviving Court Scrutiny
Some courts scrutinize due diligence declarations more than others. Here’s how to ensure yours survives review:
What Judges Look For
- Proportionality: Efforts appropriate to the case’s stakes
- Creativity: Multiple approaches, not just one method repeated
- Persistence: Continued efforts despite initial failures
- Documentation: Verifiable, specific claims
- Good faith: Genuine effort to find defendant, not checking boxes
Preparing for Challenges
Defendants may later challenge service as improper. Protect your case by:
- Keeping copies of all search results and reports
- Retaining process server declarations/affidavits
- Photographing addresses visited (showing you were there)
- Documenting exactly who said what and when
- Filing thorough declarations—they become part of court record
📰 After Alternative Service Is Approved
Once the court grants your motion for alternative service, you must follow through properly:
Service by Publication Requirements
- Publish in the newspaper specified by the court
- Publish for the required duration (typically 4 consecutive weeks)
- Mail copy of summons/complaint to defendant’s last known address
- File proof of publication with the court
- File proof of mailing
Timing After Publication
Service by publication is typically deemed complete:
- On the last day of publication, or
- A specified number of days after last publication (varies by state)
- Defendant’s response deadline runs from completion of service
🔍 Need Help with Due Diligence Searches?
Professional skip tracing provides the documented database searches courts expect. We deliver formal reports suitable for attachment to due diligence declarations—searches of credit headers, utilities, and proprietary databases unavailable to the public.
