Do police realize that the bill of rights is a provision to protect innocent citizens not criminals?

At least 80% of what the government does goes against the constitution (just read Article 1, section 8 for a list of the enumerated powers), so there's not really much point in invoking it for any reason except in remembrance of its former glory. Unfortunately, neither major party is interested in preserving our liberty, so the only other options are submitting to those in power or starting a revolution.