Customary International Law. Customary international law refers to international obligations arising from established state practice, as opposed to obligations arising from formal written international treaties. According to Article 38(1)(b) of the ICJ Statute, customary international law is one of the sources of international law.
The body quickly absorbs and metabolizes codeine narcotics.So for most standard blood or urine screens, codeine will be detectable for 1-2 days. However, codeine is detectable in hair for longer periods of time. More here on the length of time codeine stays in your system, plus how you can get addicted to codeine.ue to its short half-life, codeine doesnât stay in the blood long-term. In fact, codeine will typically fall beneath detectable levels after a day. Blood tests will probably only be ordered in situations requiring medical treatment for potential overdose or other adverse effects.
1 Blood test: around 12 hours. 2  This is the easiest test to take, as the traces of codeine fall under the detectable levels in less than 1 day. 3  Saliva test: between 1 and 4 days. 4  Hair follicle test: up to 90 days. Urine test: between 2 and 4 days. 2  In this case, proper detection depends on the quantity, the quality and the amount of time youâve taken the drug. 3  Blood test: around 12 hours.