I've dabbled in track work too, and I can attest that it's a great way to boost your speed and efficiency. One thing that's helped me is incorporating hill sprints into my routine. Find a steep hill, sprint up it at max effort, and walk or jog back down to recover. Repeat for 20-30 minutes. It's brutal, but it's improved my explosive power and overall running fitness. Give it a shot!
Honestly, I'm more worried about getting a false positive from a pre-workout coffee than actual doping