Client Login Planning Request Form

Rail Drug Testing and the Use of CDB Oil

‘Courtesy of Alere Toxicology’

An increasing number of health food stores are promoting CBD (cannabidiol) oil as a food supplement.

In this document we aim to illustrate that the consumption of CBD oil purchased from a reputable source in the UK and used in the recommended dosage is highly unlikely to result in a positive cannabis test.


Cannabidiol (CBD) oil is derived from the cannabis plant and is one of many cannabinoids present. Different strains of the cannabis plant (cannabis sativa) contain varying amounts of the psychoactive component tetrahydrocannabinol (THC). Cannabis grown for illicit drug use contains high levels of THC. CBD does not have the psychoactive effect of THC and is thought to reduce some of its psychotic effects.



Hemp is a strain of the cannabis plant grown for industrial uses such as foods, oils, textiles and ropes etc. Hemp contains little or no THC. It is this strain of plant that is used for production of CBD oil. Hemp plants grown under Home Office licence must contain less than 0.2% THC1 and consequently any CBD oil extracted from the plant will have little or no THC present.


Drug Tests

Cannabis screening tests target the psychoactive component THC and its metabolite 11-Δ9 –THC carboxylic acid (THC-COOH). The screening tests have little or no crossreactivity to CBD and consequently it is highly unlikely that a sample from a donor that has consumed only CBD oil from a UK health food store in a quantity consistent with recommended dosage guidelines would test anything other than negative.


As with all drug testing, if a sample screens non-negative, further confirmation analysis is necessary before the result can be considered legally defensible. The concentration of THC required in order for a laboratory confirmation test to be positive for THC is highly unlikely to be exceeded given the low level of THC in CBD oil products.



Back to news

More News Articles

Save our NHS.

Our amazing team at PRB Consulting were busy again last night, working with Hailsham Cricket Club, packing up food parcels for the NHS. We’re working hard to get supplies to…