Quick answer
Not reliably detected by standard amphetamine screens; a dedicated assay is needed. Urine is typically positive for about 1–2 days. In District of Columbia, marijuana status is: Recreational + medical legal.
Detection windows in District of Columbia
| urine | |
|---|---|
| Any use | roughly 1–2 days (specialised assay) |
| saliva | |
| Any use | hours |
| hair | |
| Any use | detectable on specialised testing |
| blood | |
| Any use | hours |
Detection windows are the same nationwide; only state law and workplace policy differ. Ranges vary with dose, frequency and the assay.
Testing in District of Columbia
D.C. allows workplace drug testing and employers may act on positive results. Because there is no regulated retail market, possession is legal but purchase is not; a medical card does not provide blanket protection from testing.
D.C. does not broadly protect off-duty cannabis use in employment; federal and local employers may still enforce drug-free workplace policies and test.
About Khat (cathinone)
Khat is a plant whose leaves contain cathinone, a stimulant chemically related to amphetamine. Standard amphetamine immunoassays often do not detect it.
Detection generally requires a dedicated mass-spectrometry assay; a negative standard panel does not rule out khat use.
Cathinone degrades quickly after harvest, which is one reason its presence is difficult to standardise across tests.
Frequently asked questions
How long does khat (cathinone) stay detectable in District of Columbia?
Detection windows do not vary by state — they depend on the substance, dose, frequency and specimen. See the table above for typical ranges.
Can an employer in District of Columbia test for khat (cathinone)?
D.C. allows workplace drug testing and employers may act on positive results. Because there is no regulated retail market, possession is legal but purchase is not; a medical card does not provide blanket protection from testing.
Is marijuana legal in District of Columbia?
District of Columbia: Recreational + medical legal. Washington, D.C. legalized adult-use marijuana in 2014 via Initiative 71. Adults 21 and older may possess up to two ounces and grow up to six plants at home, but there is no regulated retail market. Employers may still enforce drug-free workplace policies and test employees.