What needs to be shown? It is well known that cannabis use while driving is both very common and very dangerous[1]. Or are you trying to argue that breathalyzer

What needs to be shown? It is well known that cannabis use while driving is both very common and very dangerous[1]. Or are you trying to argue that breathalyzers are not needed to combat this problem? I would argue that the absence of these devices has caused a great deal of damage to the innocent while making it difficult to detect and punish the guilty[2]. [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836260/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3836260/ [2] https://m.huffpost.com/us/entry/us_5914a293e4b030d4f1f0f5ed https://m.huffpost.com/us/entry/us_5914a293e4b030d4f1f0f5ed