As a Tustin police officer, Mark Turner followed the golden rule: Treat people how you want to be treated. After decades on the street in a variety of roles, he found the edict served him well, even with hardened criminals. “If you treat people with respect, you get it back,” he says. Simple as that. Turner recently retired from the Tustin Police Department, where he had served since 1996. He left the department as a field training officer, but had served in a variety of capacities, including patrol officer, K9 handler, undercover officer and special investigator. The Santa Ana native,…