Be that as it may, it is still the way it is. FQ is right and the only reasonable (according to the courts) expectation of privacy is in our own homes. I spend a considerable amount of time telling my wife and kids that the cops are the GOOD guys*, but don't every invite them into our house or car unless I'm there! And no, I'm NOT hiding anything (except maybe dirty dishes in the sink). More like exercising a civil right whenever and wherever I can.
*p.s. My kids don't think the cops are bad and one wants very badly to BE one, which I'm find with. I just want them to KNOW their rights and exercise them.
There is much more of a reason than exercising your civil rights.
I read about a woman in Indiana who answered a knock on her door and found a Police Officer who wanted to ask her some questions about and incident that occurred in the neighborhood or about one of the residents of the neighborhood.
She invited him in and they sat at her coffee table while he asked the questions.
She noticed it was time for her medication so she opened her pill box and took her pill.
The Police officer asked to see the original prescription for the drug, which she did not still have.
She was arrested. Indiana has a law that states medication must be kept in the original container or the original prescription must also be in one's possession. The law was most likely to make it easier for Law Enforcement to nab illegal drug users.
She had to appear in court and the judge dismissed the case, but, no doubt, she uncured legal fees, loss of time to attend the hearing and general stress over the situation.
You may be a perfectly honest citizen, but you still might have much to "hide" when laws like these can turn you into a criminal.