Erica Maitland celebrated a landmark birthday last week. But turning 30 didn’t compare with what happened two days later: On Aug. 15, Maitland was sworn in as the Beverly Hills PD’s newest police officer after graduating with 52 other members of Basic Academy Class 236 at the Orange County Sheriff’s Regional Training Academy in Tustin. “This was my birthday gift to myself,” an emotional Maitland said. The Los Angeles native served as a dispatcher for the BHPD for more than seven years before she decided to make the decision to become a sworn officer. A couple of months before the…