The problem of course arises in the details. There is no accepted code of practice for sysadmins. All of these most would feel are reasonable actions of the sysadmin, but are also actions that a company could, after the fact, object to. Witht he law as loose as it is, they are all also actions which could be regarded as criminal and land you in jail. With purely a blanket permission to do a sysadmin's job, any such action could be disputed as not being a part of that job.
Reasonable people can disagree.
That disagreement should not land one of them in criminal court.