How much is too much when flipping?

[Ryan Blake]

What are the things that you steer clear of when flipping? I know some of the biggest issues can lead to the biggest profits but there are something I just don't feel comfortable with.

- I recently passed on a house that has a methlab in it that had high levels of some hazardous chemicals that seeped down to the studs.

- I have stayed away from homes that have fire damage

Please let me know what issues you see the most profit to be gained from and the ones that you just don't want to handle.