zlacker

Actually, there's a "good faith" (aka. "ignorance of the law") exception for cops. So even a lawyer might not be able to save you.

https://www.justia.com/criminal/procedure/search-and-seizure...

>A mistake of law by a police officer sometimes can trigger the exception. If an officer takes steps based on the existing interpretation of the law, but a court later rules that the law should be interpreted differently, they may be found to have acted in good faith.

>>gruez+(OP)
Your mainstream explanation isn't correct. This only applies when a court replaces an existing precedent - a relatively rare occurrence. Police shouldn't be expected to anticipate the court's change of heart ahead of time.