You can get basic information for free. I think you can get still get a free ancestry.com trial but I already did a trial when searching for my own family history.
The problem is that the census documents are only released after so many years. Not sure the cut off but I was seeing 1957 on alot of them. that would cover Kelly Ann Dunham, Scott Dunham and some of these other aliases. I have seen repeated reference to Stanley Ann (Anna) Dunham on the internet.
I don’t know if she went by that name or if that is just people getting the name screwed up and it mushrooming as can happen on the internet.
It seems to me that the PI or LEOs must have access to other web data bases....Do we have any FRs that fit that description?
Last night I found a search engine for port on entries but it only went up to 1959.
Census documents stop at 1930 because the 1940 census was burned and lost.
1950 is still considered a breach of privacy. So anything after 1930 is gone as far as census.
1957 is the latest for immigration.
There are some links to more current telephone registrations though.