What illegal activity are you proposing people will seek if drugs are medicinalized/legalized? Saying "oh they'll just move on" is a bit hand-wavey.
You know all those crimes that aren't substance based.
And depending on the terms of legalization, I'm sure drugs would always be a small part, whether that be black market to avoid taxes or prescription drugs.
Which isn't to say that they won't run guns and traffick humans, but right now the problem in Latin America is that these criminal organizations practically run the government they are so large. Depriving them of the drug pie, the tobacco pie, the alcohol pie... they will have nothing they can turn to that will allow them to maintain their present level of governmental corruption.
Drugs are relatively easy to produce and smuggle and have a massive community demand. Nothing else comes close.
Added benefit: fewer drug-related prisoners being trained up as career criminals.
EDIT: also, "people" refers to "people in the community taking drugs", not the gangs.
Cigarettes are legal to buy for anyone over the age of 18 (was 16 until feb 2011). Average price per pack of 20 is between £5.50 and £7; most of that is (Over 80%) tax.
High local prices, easy access to cheap foreign cigs (France is a couple of hours away and hypermarkets exist to sell alcohol and cigs to English day-trippers) mean that very many (1 in 5) cigarettes (and half of all hand rolling tobacco) smoked in the UK are smuggled or counterfeit.
Worse, there's money to be made for criminal gangs smuggling counterfeit cigs.
Cannabis is easy to grow. I support legalisation. But I am worried by the fact that criminal gangs already grow and distribute cannabis in the UK (sometimes using forced trafficked labour); by the possible harm to mental health; and by the weird culture of binge drinking and underage drinking in UK and how that would transfer to drug use.
UK annual tax income: (http://www.the-tma.org.uk/tma-publications-research/facts-fi...)
Over 80% VAT and duties: (http://www.telegraph.co.uk/finance/budget/8401996/Budget-201...)
Video report about blatant selling of smuggled cigs: (http://www.bbc.co.uk/news/uk-england-13101212)
Organised crime in Scotland and their involvement in smuggled tobacco (with 1 in 5 and half of all hand rolling tobacco claim: (http://www.bbc.co.uk/news/uk-scotland-12219726)
There are bars everywhere, cigarettes are everywhere so other than a little bootlegging of alcohol and cigs there isn't much profit in those things.
Whatever people want and whatever makes criminals money is what they will try.
There are not open markets just floating around waiting for criminals to suddenly discover them.
* Excuse for government overstep of constitutional provisions * Money to the prison-industrial complex (i know, trite, but it's true) * One more step in the notion that you don't own your own body
And those aren't legitimate reasons, IMAO.
We're seeing this with Wall Street. Dodd-Frank is raising the costs of doing business, causing the industry to down size.
Criminals are just people. They do what is most profitable for them given their circumstances. If you legalize drugs, most of the current drug criminals will get normal jobs at McDonalds or Wall Street or whatever.