Best way to make members aware of someone ripping people off in trading section?

I lean more towards the bullshit side when these problems arise. And most cases have proved me right that have come up here on FABO and other sites. Even the ones that start out as "real family emergencies" have been found not to be true but an excuse a lot of low life's live behind. Hey if I wrong I'll be the first to apologize, time will tell