Contractual Security Services & Investigations (CSSI) is based in Grand Blanc, Michigan.  Our security specialists are comprised of former police officers and military personnel with extensive training and real world experience.  We have over 25 years of law enforcement experience in addition to the specialized training in advanced security measures.

We started with an idea to create a security agency that would offer its clients a variety of services that could be tailored to the client's individual needs.

The client is our customer, and we strive to provide the best security possible for their needs. 

Feel free to browse our site for the services we offer, a sample client list and contact information.