Abstract: Law breaking events indicate state of social conditions, public trend and performance of educational and crimes controlling institutions. Statistics about crimes and delinquency are notoriously untrustworthy and unreliable, particularly in developing countries where a great numbers of crimes do not come on record for many reasons but generally these figures are used for measuring crime rate all over the world. In this study a comprehensive critical analysis on validity of official crime statistics was presented including pinpointing deficiencies and disadvantages which distort the police record about crimes and advantages for that these statistics are used. (key terms: Crime, delinquency, official crime statistics, validity, Social condition, Public trend,)