Merchants Police is a privately owned security services company. It provides investigative, consulting and guard services. It offers background, domestic, criminal and undercover investigations, as well as video and surveillance monitoring and parking management services. Merchants Police also provides passenger checking, drug testing and executive protection services. Its guard services include industrial, commercial and residential security, and routine and random patrolling. Merchants Police serves homeowners associations, apartment communities, banks, hotels, industrial and manufacturing facilities and hospitals throughout northern Illinois. It is a division of On-Line Security Systems. Merchants Police maintains a location in Rockford, Ill.