Drugs of abuse test strips are retained on the underside of a closure cap for a fluid sample container. Each strip has a bottom end defining a sample receiving portion and an indicator spaced longitudinally therefrom to visually indicate the presence of a selected drug of abuse. The closure cap is formed...http://www.google.co.uk/patents/US20050009203?utm_source=gb-gplus-sharePatent US20050009203 - Multi-drug testing device and method
