John McMahon is a licensed private investigator in Houston, Texas with over 27 years experience. Background checks, witness statements, witness locates, surveillance and due diligence.

First Response Private detective agency private investigator services are available for both Private and Corporate clients, teams of private investigators and detectives can make checks on either company competitors or partners movements.

Surveillance carried out by an A Sure Investigation private detective is the most effective method to successfully find out details about a specific case. The private detective is able to locate an individual and get information you require.