One of the people swept up in the Old Orchard Beach drug crackdown was a child sex offender who police say was babysitting another couple’s children.

Police say a couple had asked Michael Amico, 41, of Scarborough, to watch their two young children while they ran errands, not realizing Amico was a registered sex offender.

Amico is a lifetime registrant on the sex offender registry after being convicted of gross sexual assault on a person under 14 and three counts of gross sexual assault on a person under 18, all in York County.

Police said they did not want to disrupt their undercover drug investigation, so they notified a third party who informed the parents about Amico.

Old Orchard Beach police announced Monday that 46 people were arrested over a period of four months in 12 separate drug investigations. Police said the arrests are the work of a proactive strategy of dedicating officers to drug investigations.

Amico was charged Monday with prohibited contact with a minor and failing to register with the sex offender act because he had allegedly changed where he worked without notifying authorities, police said.

The parents of the children Amico supervised were among those people who were charged with drug offenses and the Department of Health and Human Services has intervened, police said.