Amphetamines (except for meth) are the best here really. Don't make you act weird, no smell, no obvious side effects. Weed is like the easiest drug to get caught with though. Strong smell, saggy eyes, red eyes, talking and acting weird, random laughing, etc. Alcohol and Benzos make you act weird and mass up your judgement so youre way more likely to get caught. Once I took 16 mg of lorazepam with a moderate tolerance (2 still got me high though), and asked my dad if we can go to a nearby waterfall. He didn't know I was into pills then so he just thought i was drunk, but I mean you can't do Benzos without getting caught. Psychedelics are a no go too, for obvious reasons. Relatively Small doses of Opiods are fine though, you act kinda tired and its hard to pay attention but other than that there's nothing to get you caught, unless you take enough to be thowing up, slurring hard, and blacking out. 15 mg of oxycodone is the right dose for your situation, if you're using another just look up potency ratio. Just to be clear, I'm simply answering your question straight up without bashing certain drugs because of their danger. You should really take your safety into account here and factor that into what you decide to do, but that's your choice, not mine. This is infromation, not advice.