Our study has been conducted on a sample of inmates from the Botosani Penitentiary diagnosed with borderline personality disorder, with an average age of 28,8 years. The following tests have been applied: the Woodworth-Mathews Test, for psychoneurotic tendencies; the Freshman Test, for the affective maturation; the Eysenck Personality Inventary – the extroversion – neuroticism – lying Scale; the Abnormal Personality Questionnaire; Cattel's Anxiety Questionnaire; and Rosenzweig Frustration Test. The outcomes included the presence of psycho-neurotic tendencies, a tendency towards an emotional immaturity, ambiversion, a moderate emotional instability, an anxiety close to the neurotic level and general behaviors inconsistent with those of the normal social group.