Is it legal or illegal for an employer to take pictures of an employee without their knowledge?

Question Details: I received a phone call from my manager stating that someone from corporate had taken pictures of me sleeping in my work truck. When I challenged my manager about this false allegation, she recanted her story and told me that she wasn't 100% sure about the location of where this photo had taken place, nor was she sure about the date and time. I'm not understanding what the motive is behind this story but I feel for some odd reason that my employer is attempting to build a negative case against me, even if I've been told recently that I am a great employee. I'm seeking legal advice just in case I become the victim of wrongful termination.

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