Drug driving is a serious offence and the police, the Driver and Vehicle Licensing Agency (DVLA), and other organisations, use what is known as endorsement codes to classify offences. All the codes explained here on this page are related to drug driving...
TT99 offences must stay on a driving licence for 4 years from date of the conviction.
To signify a disqualification under the 'totting-up' procedur. If the total of penalty points reaches 12 or more within 3 years, the driver is liable to be disqualified