yep, a drug has to pass several phases of test (animal/human
experiments), often for years and the company has to pay for that.
Here at the Univ. I study at you can volunteer for drug testing.
One of the guys here did this for cash, its quite weird.
The 'mild' version is when an existing/sold drug is tested on
people of specific age/race/diet whatever. You get $100-150 per
week, and for this:
you can eat ONLY what they give you, you have to go for
checkup 1x or 2x every day, and these checkups are pretty
thorough. the funniest part is that you have to carry a jug
with you all day, collect ALL your urine and submit it daily.
The 'tough' version is the same, just they test drugs not
tested on humans before. He said you can make $1500/week if
you go for 'brain' stuff, like antidepressants and such.
With a slight chance that your brain/nervous system gets messed up

...
There are not too many people volunteering for this.
This guy did #1 whenever he was out of cash, after all they provide
all the food too

T.