Time, October 29, 2010 by Maia Szalavitz
http://healthland.time.com/2010/10/29/marijuna-as-a-gateway-drug-the-myth-that-will-not-die/print/
The U.S.A 2010 Rand Institute report titled “What Can We Learn from the Dutch Cannabis Coffeeshop Experience?” found that there was “some evidence” for a “weakened gateway” in The Netherlands, and concluded that the data “clearly challenge any claim that the Dutch have strengthened the gateway to hard drug use.”