Regional police responded to the area of Ainslie Street and Parkhill Drive in Cambridge Wednesday afternoon.
A 35-year-old Cambridge man was wanted on a warrant, and was subsequently arrested.
Police say they seized around $800 in suspected fentanyl, $400 in suspected crystal methamphetamine, and $2,500 in suspected hydromorphone pills.
A knife and cash were also found during the arrest, according to the police report.
The man has been charged with two counts of possession for the purpose of trafficking.