Just post what loans you think are good to invest in and why.
Usually the safest loans are made to users with good reputation. However, on BTCJam, borrowers tend to use this to scam. If you see someone taking out reputation loans that slowly get larger, that person is going to scam. Watch for multiple loans at once.
Only lend to those who are in the same state as you. Once arbitration is awarded you simply need go collect the debt. Most people don't bother to collect and lenders know this, so they don't care if you have all their documentation.