Some jobs are exempt from this. Getting caught therefore with an illegal drug on you can damage many study and career ambitions. So bear this in mind if you come in contact with drugs. If you are going for a job interview, you may face a drug test, even if the job has nothing to do with public safety. The Police and Armed Services usually drug test new recruits, as well as some commercial companies.
Most tests involve taking a sample of urine.
Drugs will stay in the system for some time after you have taken them. How long that will be is different for every drug and will also depend on many other factors like individual metabolism. So what follows is only a very rough guide. This method of testing is proving increasingly popular with for example, the Police. If you are travelling abroad it is important to know the laws regarding drugs in the different countries you may visit as well as the laws in the UK on your return.