aggressive individuals
If the operator of the vehicle returns part way through the process and becomes aggressive or violent, is there a way to immediately contact emergency services OR note threats and aggressive behaviors?

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Mark commented
Do not engage avoid trouble. Call the non emergency line of your city so they can get them in the act of parking illegally.
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Robert commented
Start at the rear of the vehicle: get 2 photos, record license plate. The occupant is usually looking at their phone & won’t notice you. Then move up front for a quick snap of the windshield and walk away: do not engage.
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Virginia commented
I had someone sitting in their car; I tried to engage first to ask them to relocate (not only were they in a handicapped spot but had managed to straddle the line and take up the spot next to them as well) but she ignored my attempt to communicate. After I took the first picture of her car she decided to roll down her window and confront me. I continued the report and put in comments. I was unable to get the picture of the sign and her car well as she started backing up where I was standing. Not sure how that will turn out.