VALLEJO (CBS13) — Volunteers are teaming up with police for an unusual tactic that could deliver a painful blow to the egos of prostitution clients.

The Vallejo Police Department could soon target suspected solicitors with warning letters to the owners of cars spotted along known prostitution zones. Volunteers plan to watch the prostitution hot spots day and night and write down license plate numbers for police.

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“We run the plate, obtain the information of the registered owner, and then we send the ‘Dear John’ letter,” said Vallejo Police Lt. Lee Horton.

The exact language of the “Dear John” letters hasn’t been decided upon, but it will generally tell suspected offenders, ‘We know you were in Vallejo, we know what you were doing. Don’t do it anymore,” Horton said.

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Legal questions still remain about what could happen if the wrong person gets a letter or if someone’s behavior was mistaken, but police say suspects tend to behave in obvious ways when soliciting prostitutes.

Business owners near Sonoma Boulevard say they hope the new tactic helps squash the ongoing prostitution problem in the area.

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Police have also installed surveillance cameras in the area.