A criminal conviction stays on file forever. After a certain amount of time, many offences are considered to be spent and you may not have to tell an employer unless it is a notifiable occupation, for example a doctor.
A criminal conviction stays on your police record forever. However your question may be,do I have to tell my employer? This aspect is covered by the Rehabilitation of Offenders Act. After a certain amount of time, many offences are considered to be wiki.answers.com
To obtain the specific rules of a state regarding how long something stays on your driving record you should check with that state's department of motor vehicles (DMV) The DMV has information on the laws and regulations that govern motor vehicles and www.ehow.com