illegality

When three sheriff SUV's came roaring down the highway in full police-mode
I passed them a minute or two later (after letting them go by)
they were cornering a semi-truck driver and his associate
the driver was belly-down (he had a big one) on the ground with his hands in the air
and his sidekick had just shot his hands up
I imagined someone had gestured at him with a very persuasive tool
there were actually five semi-trucks pulled over right in a row
I wondered what they were carrying