check out NORML's website.
also, just because the law is linient in one state, doesn't mean that state doesn't have ridiculous resources allocated towards busting grows.
for example, kentucky isn't the strictest marijuana state in the nation, but McConnel just earmarked 4 million dollars for anti-marijuana eradication efforts.
in a famous marijuana documentary the kentucky national guard is seen flying helicopters, and having about 50-100 agents dedicated to finding and burning marijuana crops.
and they didn't have 1/2 the budget they have now.....
and to answer your question, no state is safe to grow in. the DEA still thinks marijuana is illegal.