Absolutely no way to tell; I just found the Lacerta files interesting so I posted the link. With this subject (considered 'lunatic-fringe' by most), all you can really do is find out what you can and believe nothing unless you can comfortably verify it with your own research.
The Lacerta information comes off IMO as one of those "if it's a hoax, it's very intelligently thought out and written" kind of deals. Perhaps future data will corroborate it. I'm curious as this is now mid-2006, whatever became of the guy who transcribed the files and especially the person who allegedly "met" the so-called Reptilian; they both claimed harassment after posting it on the Net, no? Wonder if any further developments occurred.