COSTA MESA – A 33-year-old man was arrested after police said they found 50 pounds of marijuana, boxes of brownie mix and business cards that detectives believe were handed out to high school students in Newport Beach and Costa Mesa, officials said.

Isaac Greer, a resident of Costa Mesa, is suspected of providing two teenagers from Newport Harbor High School marijuana-laced brownies that made one of the students sick. Greer was booked on suspicion of possession of marijuana for sale, transportation of marijuana, sales of a controlled substance to a minor, child endangerment and contributing to the delinquency of a minor.

Costa Mesa detectives are also investigating whether Greer may have been involved with two incidents at Pomona Elementary and TeWinkle Intermediate schools in March and April 2013, in which ambulances were called when students became ill after eating brownies provided by another student, said Lt. Paul Dondero.

In both incidents, authorities found the brownies contained marijuana. Two students, one from each incident, were arrested for taking the pastries to the schools.

Costa Mesa police came into contact with Greer after the parents of two students from Newport Harbor High School contacted police in January, Dondero said.

The students, identified only as being in their mid-teens, told police they bought the brownies from a man known only as “Clever.”

That man, police said, had given business cards with a phone number to students, and told them to give the brownies to their friends.

Greer was stopped at the intersection of Newport Boulevard and Santa Isabel Avenue and was arrested Tuesday. Detectives searched Greer’s vehicle, a storage unit in Huntington Beach and a motel room in Costa Mesa, according to a statement released by Costa Mesa Police.

During the searches, officials found 50 pounds of pot, several boxes of brownie mix, business cards like the ones obtained from the Newport Harbor High School students, scales and vacuum packaging and bags.

Greer was booked into county jail Tuesday, according to arrest records.

Police may seek more charges if Greer is linked to the incidents at Pomona Elementary and TeWinkle Intermediate schools, Dondero said.

Contact the writer: 714-704-3788 or shernandez@ocregister.com