id say they are pretty much only trained to sniff for coke/pills/mdma/speed/weed and maybe k in powder or crystal form. they can also sniff large amounts of money, but not sure if this is the money they are detecting or the drug residue on the money…
I got caught by a police sniffer human at reading train station a couple of weeks ago, it retrospect it was silly of me to transport bulk quantities of jenkem on public transport
