Cannabis samples have been routinely tested for the past 100 years or so. Only, for most of that time, the labs were partnered with the police, not commercial companies. And back then, the analytical methods were a little more rudimentary...
Take a tour through cannabis testing history with this original Analytical Cannabis infographic, which highlights:
The early, elementary methods forensic analysts would use to identify cannabis
The rise of industry-standard techniques, such as mass spectrometry and microbe plating
And the challenges cannabis analysts have yet to overcome
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