Why did one 10 mil Valium show in your urine 11 days later?

Valium, or diazepam, can remain detectable in urine for an extended period due to its long half-life and the way the body metabolizes it. After taking a 10 mg dose, the drug can be metabolized into several active metabolites, which may also be excreted in urine. Individual factors such as metabolism, hydration, frequency of use, and the sensitivity of the drug test can influence detection times. Consequently, it's possible for Valium to show up in urine tests even 11 days after ingestion.