WASHINGTON (Reuters) - President Barack Obama's administration asked the U.S. Supreme Court on Wednesday to throw out a lawsuit filed by Oklahoma and Nebraska seeking to block Colorado's voter-approved law legalizing recreational marijuana use by adults.

In their challenge to Colorado's law, filed in December 2014, Nebraska and Oklahoma said marijuana is being smuggled across their borders and that drugs threaten the health and safety of children.

Nebraska and Oklahoma noted that marijuana remains illegal under federal law and said Colorado has created "a dangerous gap" in the federal drug control system.

The headline of our post reporting that Colorado marijuana sales topped $100 million in August asked the question, "How long will they keep climbing higher?"

We now have the answer to that question.

Sales dropped from that peak in September, and again in October, the most recent month for which figures are available.

Extended restriction on recreational market and new ban on medical marijuana applications are seen as "transition phase"

In this Aug. 25, 2014 photo, marijuana store Denver Relief co-owner Kayvan Khalatbari, right, talks with his employee Jeff Botkin. (Brennan Linsley, Associated Press)

A shortened four-month expanded moratorium on new players in Denver's legal marijuana markets won easy approval Monday night from the City Council.

After longer discussions in a committee late last month, the council passed the ordinance changes quietly as part of a block vote.

New recreational products include Watermelon Sour Gummies, Hot Cocoa, CBD Wana cocoa Rolls and High CBD WanaCaps_XR

MONTEVIDEO, Uruguay -- Colorado leads the way in the marijuana business with states, countries and even Universities around the world looking at our program.  A group of Denver University (DU) students traveled to Uruguay as part of an international study program to examine the country’s cannabis culture and how it compares to Colorado.

It was a surprise for the students when they saw a glimpse of a marijuana grow cultivated by the Uruguay government.   “Wow…It was a room that looked like a field of marijuana plants. I’d never seen anything like that.” said Brittany Sandage.

In the two years since Colorado began selling marijuana for recreational use, it has become the epicenter of a booming industry, one that will gross over $1 billion in sales this year.

A Denver-based marijuana company has recalled 27 cartridges of its THC-infused vape pen oil due to potentially dangerous pesticides.

Denver’s Department of Environmental Health found that Advanced Medical Alternatives’ product contained pesticides that are not allowed to be used on cannabis in Colorado, reported The Cannabist, The Denver Post’s cannabis news and culture section.

The recall is the 13th issued by the department in 13 weeks. Advanced Medical Alternatives recalled a cannabis concentrate product that also had high levels of banned pesticides on Dec. 3.

Wine has wineries. Beer has breweries. Marijuana is about to get the Colorado Cannabis Ranch

Weed is big business and legal weed will become bigger still. That’s why American Cannabis Partners CEO Christian Hageseth thinks the time is right to open up the Colorado Cannabis Ranch, the world’s first-ever “weedery.”

After being slammed by a pot-infused edibles company suffering the blow of its third pesticide-related recall, a cannabis-testing laboratory in Colorado has a message it wants known: “We don’t want to see anyone in the industry have their product recalled or quarantined,” Gobi Analytical said in a statement released to The Cannabist this week.