From the NBC Local 24 website here
“Of the patients studied, 15 had tattoos and 17 were diagnosed as having ASPD. Of those with tattoos, 11 of 15, or 73%, had ASPD, whereas only 6 of 21, or 29%, of those without tattoos had the same diagnosis. The presence of tattoos on forensic psychiatric inpatients should alert clinicians to a possible diagnosis of Antisocial Personality Disorder (ASPD), and also about the potential for histories of suicide attempt, substance abuse, and sexual abuse, according to research published today in Personality and Mental Health.”
There sample size was only 32 people and they posted this on a news site!! Ironically the sites tag is “NBC 24… the fair, accurate, honest tv station”