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The test was initially developed in the 1930s by the French medical biochemist Pierre Duquénois (1904–1986) and was adopted in the 1950s by the United Nations as the preferred test for cannabis. The test was originally claimed to be specific to cannabis. After several modifications, it became known as the Duquenois–Levine test.
In 2015, the first government standards for testing were proposed in Colorado's legislature, when potency and microbial testing became mandatory in the state. [11] [12] [13] Colorado cannabis testing laboratories, such as AgriScience Labs, are regulated by the Colorado Department of Revenue's Marijuana Enforcement Division and the Colorado Department of Public Health and Environment. [14]
Most people who take a drug test take a presumptive test, cheaper and faster than other methods of testing. However, it is less accurate and can render false results. The FDA recommends for confirmatory testing to be conducted and the placing of a warning label on the presumptive drug test: "This assay provides only a preliminary result.
The findings dovetail with scores of complaints that two private cannabis testing labs have filed over the last eight months, reporting pesticides in products certified by other labs as safe.
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Cannabis is detectable in the blood for approximately 12–24 hours, with heavy/frequent use detectable in the blood for up to 7 days (depending on a person's blood renewal system). [ citation needed ] Because they are invasive and difficult to administer, blood tests are used less frequently.
Má (Mandarin pronunciation:), a Chinese word for cannabis, is represented by the Han character ้บป. [2] [3] [4] The term ma, used to describe medical marijuana by 2700 BCE, is the oldest recorded name for the hemp plant. [5] The word ma has been used to describe the cannabis plant since before the invention of writing five-thousand years ago.