That would require committing a crime (in the US at least).
https://en.wikipedia.org/wiki/Legality_of_piggybacking#Unite...
This is too funny - why would you admit, to a cop, what you are doing??? You just say you are sitting in your car enjoying a nice day - and it wouldn't be a lie because technically you are. It just so happens you are doing other things as well.
> He had been accessing the Internet through a nonprofit agency's network from a car parked nearby and chatted with the police officer about it.
If you are thinking "but surely the legal system should understand this concept, right?"
> "I had a feeling a law was being broken, but I didn't know exactly what"
Or how about the library who didn't mind a patron was using their wireless system - but the police still wanted to press charges:
> The library director said that Tanner had not broken any rules, and local citizens criticized police for their actions.
From one of the news articles:
> The police officer confiscated Tanner's laptop in order to inspect what he may have been downloading,
That is a big NO. If a police officer ripped my laptop from my hands - I guarantee it would be a decision we would both regret.