A man with no fingerprints was held on half a million dollars’ cash bail this week after Boston and federal investigators recovered 361 grams of heroin in his pants, Suffolk County District Attorney Daniel F. Conley said.

JORGE FALCON ORTIZ, believed to be 28 and living at an unknown address, was held on the $500,000 cash bail recommended by Conley’s office at his June 23 arraignment on charges of trafficking in a Class A substance. If convicted of trafficking in more than 200 grams of heroin, Ortiz faces a 15-year minimum mandatory prison term.

Called to assist U.S. Immigrations and Customs Enforcement agents in the course of that agency’s investigation, Boston Police on Tuesday afternoon responded to the intersection of South and Bussey streets in Roslindale to stop a 2006 Honda Civic.

The officers pulled the car over and directed Ortiz to step out. When they did, they noticed a large bulge in his pants. Asked by the officers what the bulge was, Ortiz allegedly stated that it was “drugs.”

The officers then removed from Ortiz’s pants a plastic bag containing two smaller bags, each filled with a tan-colored powder consistent with heroin. The contents of the bags weighed 361 grams.

Efforts to check Ortiz’s criminal record and background were unsuccessful because his fingerprints had been mutilated, prosecutors said. Authorities are attempting to use other means to identify him conclusively.

Ortiz was represented by attorney Thomas Amoroso. He will return to court on July 20.