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.
Quick Answer. There are a number of reasons why a toilet may make noise after flushing; however, a loud noise that takes more than a minute after flushing the toilet may indicate a restricted water flow or a problem with water pressure. In such a case, the pressure valve should be adjusted while the toilet is making the noise.
This is likely caused by one of your fans. If one has collected dirt over time it can cause a loud humming sound when active. Try and figure out which one is causing the noise, if it's not the CPU fan, you can probably clean it yourself using a can of compressed air or a vacuum cleaner (careful with the PC components!). If it is the CPU fan, it may be best to have an expert clean or replace it.