Glad you asked...
If pork is bad it will have a nasty smell to it and a slimy coating. Bad pork can make someone very ill so if you are unsure about if the pork is bad or not, the best thing to do is to toss it out.
Then again, this answer might help you...
You can't tell if pork is bad by the color, you have to smell it. If the smell makes you want to hurl, then it's bad. This goes for beef and chicken, as well.

