Macdonald triad

The Macdonald Triad is a set of three behaviors that were thought to be linked to certain kinds of criminal behavior in adults. The three behaviors are: cruelty to animals, bedwetting or daytime wetting, and fire-setting. Researchers have found that adults who had these behaviors as children have an increased chance of becoming criminals. So, the Macdonald Triad is three behaviors that may be signs that someone could grow up to be a criminal.