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Though there is no such thing as a urine-detecting dye, you can purchase signs that prey upon the misconception that a urine indicator exists. The signs, which warn the pool is being monitored with a chemical 'wee alert', are believed to be an effective deterrent against urination in a pool, particularly with adult swimmers. Up Next. Up Next.
This is the reason that drug tests, namely urine tests, look for 9-carboxy-THC. Many of the following numbers are estimates. Typical Periods of Time that Marijuana Use May be Detectedâ¡. â¡ Some private companies may use hair tests to detect possible marijuana use.The detection period for 9-carboxy-THC in urine may be as long as three months in extremely heavy users. Research on saliva tests indicated that they may be able to detect THC up to eight hours after ingestion but they aren't widely used.