Probable cause is based on whether a reasonable police officer under the circumstances would have genuinely believed the knife to have been unlawful. If so, the fact that the knife might later be determined to be lawful would certainly be cause to discontinue efforts to prosecute, but it wouldnt retroactively make the officers conduct in making the initial arrest unlawful.
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Any prosecutor who doesn’t know the above is incompetent.
If this type of knife is found to be legal to “get” these officers, would that result in a smart Defense Lawyer being able to go back over any other arrest and convictions related to this type of knife and get them reversed? Sue for false arrest? etc.
I see on TV all the time that a lying cop, bad lab work, etc. calls old cases into question.
I say open the doors and let them all out, Officers all resign. Let the Dems have what they want.