Depending on the frequency of use, cocaine will remain detectable in a person's urine for between 2 and 30 days. So how long will one line of coke stay in your urine? If this one line of coke is an isolated event, in other words, if it is not one of many lines within a relatively short period of time, it should clear urine within two to maybe four days.
- How Long Does one Line of Cocaine Stay in Your System?
This is an altogether slightly different question. Although an occasional line will no longer be detectable in urine after two to four days, regular use could lead to it being detectable in urine for up to 30 days.
Blood Tests should be clear of signs of cocaine use within 24 hours, apparently regardless of frequency. It should, however, be noted that continuous use will eventually lead to increased tolerance. This in turn will lead to the processes dealing with the cocaine and removing it from the bloodstream slowing down, subsequently making it detectable for longer.
Whether cocaine is detectable in saliva again depends on the regularity of use. A single, occasional line should be no longer detectable after a day or two, several lines or regular frequent use can produce positive results for up to ten days.
The hair is the last part of a body from which cocaine, or any other type of drug, for that matter, will disappear. All testable drugs will produce a positive result in a hair test for up to 90 days. In fact, this is the only timescale used for testing. Drugs are actually detectable in hair for much longer, because once they are deposited in the hair, they remain there until the hair is eventually cut.