Not all cannabis testing is equal, but the USA’s National Institute of Standards and Technology (NIST) is aiming for it.
Legally speaking, the only thing distinguishing hemp from marijuana is its THC level. Not so long ago, the presence of any level of THC in cannabis made it marijuana at a federal level in the USA, but the 2018 Farm Bill made hemp with less than 0.3% THC legal.
THC testing can be a particularly difficult task where the cannabinoid is at low levels and one lab’s results may differ from another due to different methods or even just plain old human error. There can be a lot at stake – a farmer’s crop.
“If you’re going to confiscate a farmer’s crop, or subject a person to prosecution, you want to be sure that measurement is accurate,” said NIST research chemist Brent Wilson.
NIST has issued an invitation to labs to participate in a study that will assist them to produce the accurate measurements required to make a reliable call as to whether a cannabis sample is hemp or marijuana.

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