[Old Teufel Hunden]

"Such snooping is a lot easier now with the huge variety of high-tech "toys" the government has for seeing through walls, listening to conversations or following individuals through the use of GPS devices."

That has nothing to do with the third amendment. What you are talking about is fourth amendment rights being secure in your home against unreasonable searches. This is the text of the third amendment:

"No Soldier shall, in time of peace be quartered in any house, without the consent of the Owner, nor in time of war, but in a manner to be prescribed by law."

Now please show me in the above text where there is explicit or penumbra prohibitions against governmental snooping?

[oldfart]

If the only issue was with feeding and housing the soldier you would be right but the secondary issue is surveilance. Imagine what could have happened (or NOT happened) if the British army had quartered a few soldiers in the homes of Adams, Jefferson and Franklin. Fortunately for us now, those guys were all on the run from the British and a bit hard to find. There were lesser leaders though and some of them had a redcoat or two living with them.

The fourth amendment does cover search and seizure but only those acts that are overt. Covert “searches” were still carried on by those soldiers who reported to their officers each day.