.........Don't know about Locaters Plus, personally. But you're doing the right thing - asking around for recomendations of this search company. Go to some other adoption sites and post as well. See what kind of feedback you get. Do a google, dogpile, ect ect- see what comes up. Check with the BBB too.
This link might be of some help too.......
http://forums.adoption.com/t140496.html
look at the searchgurus post for info on using a professional searcher- very good guidelines!
I used a PI that had a NO find- NO fee policy. If she couldn't locate with current, and correct contact info- I paid NOTHING. Not a cent. All info I had to give her to begin the search was "non-identifying'.
Happily, I got it all- the whole 9 yards- no conditions, no qualifications, even info on sibs, and extended family, including ex's. It took a little less than 3 months.
What's going on in MD now with your search?