Any drug, alcohol included, will have an effect on driving and motoric skills.
Interesting website, the Australian Institute of Criminology...
One thing I noted, was as you say, there seems to be an awful lot of stats related to Alcohol, and a few related to drugs (maybe this in itself says where the true Australian problem lies?). reading through these, they tend to throw all drugs into one pile, and not break them down. Probably just to hard to break down, as the stats seem to be predominately from a police officer base, and I question the level of medical input. (undoubtedly there) Very interesting none the less.
With the police drug scanners, they will pick up a lot of different drugs, and as Cannibis is illegal, the crims distributing it are often distributing a lot of other drugs, so voila, swipe the weed smoker and you may very well detect other substances. This may alter "stats".
Whilst I appreciate emergency nursing and paramedicine, been there done that, also held people down in a psychosis etc, one thing I noted is that if someone was in casualty because they did something illegal, they will lie. They know they have done drugs, they know you know, so what's the least "offensive" drug they can say to avoid their "mothers" disapproval? (very Freudian) weed of course. When I moved to the ICU, you get a lot of long term blood results and can often talk to the patient in a relatively lucid manner, over a longer time span, and you more than often find out that other substances were involved. A lot of these results and longer converstaions, (sometimes going on for several days) are unfortunately not always available in emergency medicine... and crims lie.
I personally don't recall a stoner becoming overly aggressive, but mix it up and who knows what you get...
I feel if it is legalised, you will create a gap between the crims pushing Meth (etc) on a weed smoker, (pushers are good at their jobs, easy enough to get someone stoned, then push some crack onto them as their inhibitions are down, create a true addiction and earn the longer term dollar) The weed smoker will no longer be exposed to that level of criminality, and will have to look for it if that's what they want (but that's a whole new topic) You will also significantly reduce an income stream to criminal orginisations.
Just my experience talking, others have their own experiences, and I buy no means wanting to devalue them, and definately will never put down nurses and paramedics, true heroes.
or,
I could just put a

at the end, absolving me of any bad intentions!

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