CALDWELL -- After more than a month of investigation, Caldwell Police have arrested three people on drug trafficking charges.

Eighteen-year-old Krystal Garza, and her parents, 53-year-old Gabriel Garza and 46-year-old Maria Garza, were arrested on charges of trafficking and possession of 1.2 pounds of marijuana.

The investigation started on May 14th when Caldwell Police detectives followed up on an alleged aggravated assault complaint against the Garza's son, documented gang member Julian Jose Garza.

While at the Garza residence in Notus - detectives found evidence of marijuana trafficking.

After some investigation, police arrested Krystal Garza for possession of marijuana and drug paraphernalia on May 29th.

Gabriel and Maria Garza were arrested Friday on charges of marijuana trafficking.