Once MJ is legal, people won't need to hide the fact they are purchasing it.

You really think the evangelical, anti-crime and national security GOP folk are really going to end the War On Drugs if they gain power in 2016?
Absolutely not, Reagan started the war on drugs and I'm pretty sure the GOP would carry on the same regardless of all the evidence proving it's been a huge failure.
The only beneficaries of the drug 'war' are the for-profit prisons and the corps who take advantage of a cheap labour force.