Law enforcers have the right to seize illegal items when they are legally at a location under the warrant related requirement of

I believe the answer is: plain sight

Plain sight means that the law enforcement could make the seize without conducting research to the owner's private property as long as the law enforcers see the drugs directly during their patrol.
If they want to seize the illegal objects outside their patrol, they have to get a search warrant from the government.

The  ancient egyptians  who  built the pyramids  may have been  able  to move massive stone blocks across the desert by wetting the sand in front of a contraption  built  to pull the heavy objects