I have to say, I really don't know what a "PhD Lab" is. Is that where they study PhD's or are you actually talking about an academic research lab that has a doctoral programme? From my perspective, most of your concerns are unsubstantiated... not unimportant, just "feelings" based. The real...
As a complete aside, why not go and talk to someone in the radiation oncology department? If you have an MB, you can do many things in a combined MB/PhD program.
Radiation oncology is all about applied particle physics. Lots of neat problems to solve and a great way of having your cake and...
There are several factors that must be considered.
As stated before, each drug has different windows of detection.
It also depends on what model of drug testing is being considered.
For example, in regulated testing (such as DOT testing) there are specific thresholds set by government...