Criminal Defense Investigations
Independent fact development for defense attorneys who need a clearer account of what happened, who was present, and which parts of the record deserve closer examination.
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Local knowledge. International perspective.
Houston private investigators. Clarity when it matters.
Bilingual private investigation services for attorneys, businesses, and private clients in Houston, Clear Lake, Texas, and matters involving Mexico.
Licensed in TexasDPS A18949
English & SpanishDirect, clear communication
Attorney supportFacts, witnesses, documentation
Mexico experienceCross-border case coordination
When the details matter, look closer.
International Specialized Investigations helps clients develop facts, assess conflicting information, and make informed decisions. A useful Houston private investigation starts with the question you need answered. We match the assignment to the people, places, records, and deadlines involved, then distinguish documented findings from leads that still need verification.
Surveillance Investigations
Discreet field observation that documents relevant activity for legal, business, and personal decisions.
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Missing Persons Investigations
A structured review of leads, timelines, and available information for families and attorneys seeking answers.
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Child Custody & Family Investigations
Objective documentation for family-law matters where reliable facts are more useful than accusations.
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Corporate Investigations
Discreet fact finding for business leaders and attorneys managing uncertainty, misconduct concerns, and commercial risk.
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Investigations in Mexico
Bilingual coordination and practical field experience for matters that cross the Texas–Mexico border.
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For attorneys and legal teams
Stronger preparation starts with better facts.
Criminal defense and civil litigation may turn on a missing witness, an incomplete chronology, or a statement that needs closer examination. ISI supports counsel with independent interviews, records research, scene review, surveillance, and organized reporting. Bilingual interviews help clients and witnesses explain their account in the language they use most confidently.
Explore attorney services →Houston, Clear Lake, and the communities around you.
Explore local private investigator services for League City, Webster, Seabrook, Friendswood, Pearland, Pasadena, Galveston, and surrounding communities. Each local page explains ISI’s surveillance, legal, family, background, and business investigation services for that community. Tell us the actual assignment address so we can discuss travel and availability.
Experience that crosses borders.
An investigation involving Mexico requires more than translating an address. Language, source reliability, local practices, and available field resources all matter. Ryan Grayson brings more than 20 years of investigative experience operating in Mexico and firsthand knowledge gained from living and working there. Each cross-border assignment is assessed for its own scope and practical requirements.
Investigations in MexicoA clear process from the first conversation.
01
Define the question
Explain the concern, relevant locations, and deadline. We identify what is known and what needs independent verification.
02
Agree on the scope
Discuss investigative methods, availability, anticipated costs, and reporting before fieldwork begins.
03
Review the findings
Receive factual reporting with supporting material where available, including limitations and unresolved questions.
Proud member of TPIA
International Specialized Investigations supports the Texas Professional Investigators Association. Ryan Grayson is its current and founding president, committed to education and professional development in the investigation industry.
Start with a clear question
Get the facts you need to move forward.
Tell us the location, the question, and your deadline. We will discuss the scope, availability, and reporting before work begins.