Charles Manson Has No Criminal History According to Worst Background Check Ever

Charles Manson never ran afoul with the law in his 83 years of existence on this Earth ... this according to a recent background check on the convicted killer.

Manson's pen pal, Michael Channels, filed new legal docs in his fight over Manson's estate. Included in the docs -- to determine how much property was in Manson's name -- was Manson's background check performed earlier this year, and the results are stunning.

According to the docs, obtained by TMZ, "Charles Milles Manson" with a birthday of "11/11/1934" triggered "NO RECORD FOUND" results under federal criminal court and national criminal record search.

Tad oversight, for sure. Manson, of course, masterminded one of the most heinous murder sprees in American history. He was convicted of first-degree murder and sentenced to 9 consecutive life sentences.

Couple reasons why the background check might have missed all that -- the database might not go all the way back to when he was convicted (January, 1971), and including Manson's middle name and birthday may have thrown off the search, since it's possible Manson's criminal record doesn't include his middle name.