Cops Investigative Services  include criminal, civil and domestic case investigations.  We conduct mobile and fixed surveillance, background searches, location of missing persons, and documentation via the latest digital camera equipment.  All investigations are conducted in a highly professional manner.

Process Service

Local service in Washington and Frederick counties or nationwide. Professional and experienced process servers dedicated to full-fulling our clients needs. We have an extensive network of offices throughout the country.


Cops Investigation Services have professionally experienced people who conduct all types of surveillance. They utilize the most current photography and tracking devices which includes digital photography and GPS vehicle tracking. 

Polygraph Testing

Dan Seiler provides expert polygraph services in a wide verity of areas.  Dan tests issues involving domestic fidelity, criminal and civil cases.  Dan Seiler is also certified for the testing of sexual offenders mandated for treatment.   For more information go to:

Background & Records Searches, Missing Persons Location

Cops Investigation Services the following records search services, most of which are available nationwide. To place an order for a search, please contact us via this web site, or call Peggy Seiler at 301-791-7039, ext. 102

  • Why YOU should choose COPS

    We are a full service, licensed, professional private investigation firm located in Hagerstown, Maryland. Our commitment to excellence in the investigative field is unmatched and our dedication to solving your case is unparallelled. Our trained investigators are standing by to assist you!

    Contact COPS now!