Depending on where you plan on doing the investment activity, there may be special rules you have to comply with to protect yourself. I strongly recommend finding and consulting with a lawyer familiar with the rules in your state.
For example, in California, buying property from people in foreclosure requires special forms of contract and disclosure, as well as a bond. These rules exist to protect homeowners from being taken advantage of due to their situation. While many investors ignore the rules, they do so at their peril: California District Attorneys and the Attorney General's Office are pursuing people who take unfair advantage of people in foreclosure.
Jason S. Buckingham
Attorney and Real Estate Broker
Law Offices of Jason S. Buckingham, Inc. (http://www.jsb-law.com)
Buckingham Commercial Real Estate (http://www.buckinghamcommercial.com)