Welcome to Tri-State Detective Agency of Philadelphia PA! Tri-State was founded by Thomas Nixon in 2007 after serving the bail bond industry for over 15 years. The agency now includes a full staff of private investigators with a diverse range of backgrounds and experiences. Whether your company requires surveillance, skip tracing, address verification, locate and apprehension and surrendering of your client. We are from the area and have a wonderful relationship with local law enforcement agencies and know the streets better than your agents therefore we would be an asset to have in your corner to bring this case to a successful close. Our private investigating services include cheating spouses, missing persons, asset checks, background investigations, and much more! Call today.