+ study of 44 thieves supports the theory
- criticised for reasons including:
—> the data was obtained through interviews which could be distorted through the social desirability bias
—> criminals may not be the most honest group to interview, and may try to shift the blame onto their mothers or childhood.
—> the study used retrospective data meaning the data gathered may be incorrectly remembered making it invalid
- opposing data for the theory: lewis 1954: analysed data from 500 young people and found MD was a poor predictor of future offending.
+ has made a positive contribution to criminal psychology. Researchers have pointed to the importance of childhood experiences and parent child relationships as an influence on offending e.g Blackburn.