Drug testing kits for urine and saliva are now available to screen for most drugs of abuse including many so called legal highs (now actually illegal under the New Psychoactive Substances law. )
The drug testing kits are very simple to use and give rapid highly accurate results within minutes. They are particularly useful in a workplace setting where being under the influence of drugs or alcohol could endanger the worker or others working with them or members of the general public.
The cheapest and easiest form of drug testing kits are urine drug tests. These are very simple to administer and read. Saliva testing using an oral mouth swab is a slightly more expensive option, and it can sometimes be difficult to get an adequate sample if the person being tested has a dry mouth or is anxious. Oral drug tests are popular with employers, as the chain of custody is much simpler as you can be sure that the sample that you have is from the person being tested.