You can buy the rapid tests used at my local community drug & alcohol service online, although they’re a bit expensive at $25 a piece for a urine test.
That said it detects all the usual suspects from THC to benzo’s & opioids etc with really good accuracy providing a weak or strong positive within minutes. Just google “DrugCheck NxStep Onsite Test” and you will find them, not sure if this is what you’re after but they work goodluck!