The idea is to make the ratio of water to drug metabolites in your bladder as great as possible. When you give the Sample
, don't put the start or end of the <span style = 'background-color: #dae8f4'>Urine</span>
stream into the cup.
While half-life tells you apprx how long the drug may be active in your system, the metabolites from
drugs can be detected for days or weeks, depending upon the drug. Opiates such as hydrocodone, I believe, are detectable within 2 to 3 days of use.