International law. International law is the set of rules generally regarded and accepted as binding in relations between states and between nations. It serves as a framework for the practice of stable and organized international relations.
A blood test can usually only detect codeine for 6 hours or so after a personâs last use. A urine test can detect codeine in a personâs system for 1 to 2 days after their last use. Saliva tests can determine codeine use in most cases for up to 4 days after its last use. Hair tests, which are some of the most powerful drug clearance testing options, will often be able to determine oneâs use of codeine for up to 90 days after their last use.
This means that it may take up to 24 hours to completely clear codeine and its metabolites from your system. Variables That Influence How Long Codeine Stays in Your System. Itâs important to understand that how long it takes codeine to leave your system varies from person to person. There are a variety of factors that influence how long codeine stays in your system after your last dose. Some of these variables include: Age; Weight; Height; Body mass; Body fat