No, I just recently tried.
Though there is something odd with this website, imo.
In order to get the screen shot, I had to give an email address. I took the shot then posted it here. I just went back to the site after reading your question about getting info about Adam Lanza's mother.
And the website asked for my username & password. Well, I didn't sign up with a username & password, I just gave an email address.
Anyways, I thought I would try & used a username & a password that I have used before, and I got in on the website, but I noticed the username that was welcomed onto the site was not the one I typed in.
Anyways, I went on to try to do a search.
Seems that one has to purchase (at a price) a membership level that will allow different search options. Also, found out later that as a first time guest user, I was only allowed one search to perform. Not knowing this, and using the "first name/last name" option for my first try, I put in Adam Lanza's name. The screen shot of the results is below.
So, as you can see from the results of the "first name/last name" search option failed to work. Going back to the explanation page, it appears that I would have to have paid money to do that kind of search. Not sure, but I think, in order to do a one time search (without paying money), I would then have to have Adam Lanza's SSN in order to have it bring up the information.
So, someone over at GLP would have had to pay in order to do that kind of search. To have the results come up at all for Adam Lanza, one would have to have paid money to access files using first last name option. Or, have the social security number to access the individual's information. Not certain about GLP these days, I have seen some people express an opinion that it has somewhat of Sorchal Faal element.