I have a pre-employment drug test coming up in a few days for a very prestigious defense contractor. 11 days ago I did a good amount of ketamine, smoked a joint and took a Valium. Before that I was smoking weed once a day for about a week. I used an at home drug test and tested negative for everything but the line for THC was pretty faded. Looked like it was almost a positive but I could be overthinking. My drug test is in 4 days so Im gonna retest then. My question is, how accurate are the at-home drug tests? Could I still have Valium in my system in a very small quantity that an at-home test wouldn't pick up but a more professional lab test would? Also is synthetic urine like quick fix worth it? I heard that some tests can detect fake piss. I might just be overthinking but Im not gonna get an opportunity like this again so I need to be clean. I want to just take the test but I'm scared ill pop. On the other hand, If I use quick fix I'm scared it will pop for synthetic urine. Like I said my test is in 4 days so I have some time to drink a shit load of water.