A few of the advertisements to sell marijuana online are seen on a Denver Craigslist page, on Monday, Jan. 23, 2017. Legal marijuana is widely for sale in Colorado, but a bill moving through the state Legislature aims to crack down on those who sell weed illegally using online ads such as Craigslist. A bill approved unanimously by the state Senate on Monday, Jan. 23, would make it a crime to advertise pot if the person doesn't have a license to sell the drug. (AP Photo/Brennan Linsley)