How long do drugs show up in your system in drug test?

Nearly all drugs besides weed will show up 3-5 days after use.

Weed can show up as long as 30 days if someone smoked a lot daily, is fat(THC is stored in fat cells) and only drinks soda(it doesn't filter the THC out of your system as quickly as water). It has never been shown to stay in anyones urine longer than 30 days from smoking it. Hair tests can still show up to 90 days though.

For most people you'll be clean from weed within 5-10 days if you do it a few times a week but don't risk failing a drug test.

Source: I'm a pharmacology student.