[PAR35]

but isn't the public library's system wireless Internet system meant to be used by the public?

Depends on why he was using it instead of a connection that could be tied back to him.

"The police officer confiscated Tanner's laptop in order to inspect what he may have been downloading, Remaley said."

The case will probably go away if there isn't anything illicit on the machine.

[blu]

He was using it to run an online game...his parents don't let him use the home computer after 9p.m. (sheesh! he's 21, FGS!)

[aruanan]

Depends on why he was using it instead of a connection that could be tied back to him.

No, it doesn't. Libraries have wireless for anyone with a laptop who wants to use it.