A coworker short changes everyone at my job _ she comes in late ~ go home earlier than her usual time.. he really take advantage of the agency... If I go to my superior nothing will be done and I still have to put up with an angry co worker day in and day out.

Unfortunately nothing will probably be done about this situation and your going to the supervisor will only make you look bad. I had a similar situation a few years ago where the "girls" working next to me did not clock out for lunch but ate their lunch at their desk, emailed and sent personal messages to their friends and relatives all day long - yet they got paid overtime at the end of the week as their lunch hours were not accounted for. I got a huge bowl of "thanks" from the supervisor when I pointed out this behavior and I ended up with the short end of the stick a few months down the road where I was laid off and not them. Go figure.

Just bide your time and your coworker will be discovered. If you can't stand this sort of behavior may I suggest that you get another job elsewhere as this situation is not about to remedy itself unless she decides to quit and go elsewhere.

You do your job and let them break the rules, so the company knows about it, and says it is OK.

It's your manager's responsibility to be monitoring the people that he or she is responsible for. It's called 'management'.

If your co-worker is flouting the rules, you manager is responsible, not you. Stay out of it.

If you say something, your manager may be initially grateful, but in the end everyone hates a person that 'tells' on someone else.

You won't be a winner, in the end you'll be a whiner.

You're there to do your job, so do it. Don't worry about everyone else.

If this is so obvious to you, then it's obvious to someone else. Let her dig her own grave, just keep your foot out of the hole.

I agree about not getting directly involved. The "no good deed goes unpunished" is evident in how often the whistle-blower gets shafted even though they aren't the bad guys here.

Alternately, you can specifically report all of this information in an anonymous "tip" mailed in to the supervisor and the supervisor's supervisor, if it's REALLY that big of a deal. Make sure your note does not use verbiage traceable to you, perhaps nothing more than a series of facts and figures, little emotional content.

After your anonymous tip has been mailed, as the others have suggested, forget about it. You can't act like you know anything even "should" happen, the tip isn't from you, right?