That is what I was asking my wife when we bought them. I really don't no! My wife was thinking that the police department might have a special tool to remove them. You don't have to add the insert to fill the hex, or maybe just use an adhesive on the backside. Then just pry it out if needed?
EDIT: My wife was watching me write this and said that there is an instruction on how to remove them. I can't look for it tonight and I will be busy all day tomorrow...let me do some homework and find out.
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