Laws and policies will not stop erosion of privacy by government or big business. Why? Because they really aren't accountable to anyone, and whistle-blowers get into severe trouble.
If something CAN be done, then it is likely it WILL be done... especially if it one or more of these:
* Important to them
* Has precedence
* Already being collected
It is like a microphone in a device- The way to ensure privacy isn't to list all kinds of rules and laws and disclosures, it is to put a hard switch on it so the user has the option to turn it off.
Freedom and privacy shouldn't be exclusively to trying to limit what we DO with the information once it is collected. The only real way to ensure you are not being tracked is to prevent the collection of information in the first place. The only sure way to know a license plate scanner isn't being used improperly is to not use them, or limit the scope of how they are used. The only way to know cameras aren't tracking you is to not have cameras everywhere. The only way to know people can't potentionally abuse your messaging is to have encryption that can't be broken and without back-doors.