[Piskvorrr]

Depends on the [federal & state & local] laws applicable; similarly in other countries. The usual procedure seems to be "here's your two weeks' notice, your electronic access rights are already revoked, kindly give us the access badge, security will escort you out; we will still pay you for the two weeks (as required by law) - but for obvious reasons we don't want you touching our systems during that time."

That said, most terminations happen without such theatrics; perhaps the person was already given the notice, two weeks earlier?

Oh, and IANAL.