A Long Island couple was arrested after officers allegedly found a “significant quantity” of heroin in their car along with their 5-month-old son during a traffic stop Tuesday afternoon, Suffolk County police say.

The couple was stopped after officers said they saw the car driving erratically on Expressway Drive North in Ronkonkoma, police say.

When officers approached the car, police say they smelled marijuana. When asked, the father allegedly told police that he had just smoked pot. 

Officers investigated further, police say, and found the heroin and the infant. Both parents were arrested and charged with endangering the welfare of a child and second- and third-degree possession of a controlled substance.

The mother also faces criminal impersonation charges and received several traffic tickets.

The boy's father was additionally charged with two counts of criminal contempt for violating an order of protection.