At least nine women in Saco have filed reports recently and three police departments are investigating claims that the women became violently ill.
Sgt. Wade Betters of the Bangor Police Department said it happens in Bangor but not often.
Betters said he suspects most cases go unreported because the victims may be embarrassed and may suspect something did happen but talk themselves out of believing it.
Betters said that drinking from a bottle or can is safer when going out.
"If you're going to go out and drink alcohol or drink wherever you're going to go whether it's alcohol or not, you know. Make sure you monitor your drink closely and don't leave it abandoned if you go to the bathroom at the restaurant and you have a drink take it with you or leave it with somebody you actually trust," he said.
Betters said that anyone who suspects that their drink was drugged should go to the hospital so that police can then take action if a substance was introduced.