Check fraud is among the oldest and most common forms of financial crime. A typical check fraud is defined as using forged, falsified or altered checks to pay for goods or services. There are more and more types of check fraud now.
For example, the most common check fraud is that people buy something from you and send you a check which is fake will bouce or has been reported stolen, or something like that.
Besides, people might buy something online and send you a check of more money, then tell you he/she made a mistake and ask you to send the extra money back.

One can never be too careful.

I'm facing such problem at the moment. And it makes me really angry and annoying.
That's why I've do a lot of search online about the topic.
I've writen down some information I've gather in a post on my blog:
http://bgnentrepreneur.net/avoid-mon...-due-to-fraud/
Check it out if you are interested in the topic.
Hope it will be of great help to you.