I think it's a good idea, you shouldn't be driving under the influence of anything.
The reason the law is the way it is, is because in the UK we don't have illegal drugs, merely controlled substances. The act of consuming a drug isn't illegal, it's merely our property rights which have been stripped.
Because of this, there can be no law against being under the influence of a certain drug. The law was drafted as such, because compounds like Insulin are controlled substances.
This way, if a diabetic goes hypo whilst he's driving due to his own negligence, he can be prosecuted, but a policeman can't pull someone over and arrest them for driving whilst under the influence of insulin, if there was nothing wrong with their driving.
Aside from all that, you seem to have completely overlooked the most obvious one here - THC (or trace detectable amounts) stays in your system for up to 28 days. That means, I can smoke a joint today, and if this legislation comes into play with a zero tolerance policy (very possible with a new Conservative government), any time I'm stopped in the next 4 weeks whilst driving, I can be piss tested and potentially lose my license.
How is that fair? How is that helping anyone? I smoke a joint, 3 weeks later I'm arrested and lose my driving license, and also my job. I'm left with a criminal record, no job, I'd probably end up on job seekers allowance, the police would have to be paid for their time and all the paper work they'd have to fill in, as well as my solicitor and all the legal staff involved in my sentencing.
Basically, a victimless crime ends up costing the government many many thousands of pounds, costing me my job, and costing society at large another chunk of their civil liberties.
^^^ Same here.
They need to clampdown on people with caffeine in their system too.
Saying people shouldn't be driving on anything is ridiculous and unworkable. What if I were to take my asthma inhaler whilst driving? Should a recovering opiate addict on methadone not be allowed to drive?
As for clamping down on caffeine, sure I can see it to an extent if you're railing 150mg lines of caffeine, but where do you draw the line? Is 1 morning espresso ok? What about 3? Is a can of coke ok?
If we're to take a zero tolerance approach, does that mean that you're also not allowed to eat chocolate whilst driving, since that contains caffeine, amongst other drugs (theobromine and phenethylamine)?
What about anything with processed sugars in them? Are we allowed to consume those? Saying you shouldn't be driving on
anything is quite frankly a ridiculous unworkable suggestion.
The whole notion of restricting things is ridiculous. Sure, if you're drunk or stoned or whatever and you crash and kill someone, you should be prepared to do time and accept that in this society actions have consequences, but if you don't crash, you get home safely without injuring anyone, your "crime" has had NO VICTIM and hence shouldn't really be a crime.