Check out those restrictions. They are essentially the same restrictions place on other citizens. A non-cop cannot just up and search my house. A non-cop cannot stop me on the street and command my presence. Cops can only do these things when their authority specifically allows them to do these things. Because of that, rules are developed that stop them from taking actions that would exceed that authority. The rules stop them from doing things that non-cops couldn't do anyway.
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It goes further than that, constitutions are laws for government and it's agents.
Our RCW's even recognize this when it comes to use of force, in a legislative note it talks how police or more restricted than "civilians".
Proactive policing by the government is not an authority granted them, and is contrary to our common law founding. Government looking to see if you broke any Malum prohibitum laws is a gross injustice.