TV myth. You do not have to reveal you are law enforcement when asked. That's the whole point of undercover operations. Some TV writer years ago came up with the "if you're a cop, you have to say so now or it's entrapment" concept. Pure bullshit, and I expect some of our resident internet lawyers will chime in.
I'd ask a lawyer in my family but the request for clariticcaton inevitably get back to my sisters and beyond.
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------------------- Mild Mannered Minion ------------------- I feel the pull on the rope, let me off at the rainbow -Anyway, Genesis