Back in October I accepted an internship offer at a reasonably large and reputable company. I did not sign anything, but over email I said that I accepted, and the recruiter said that she was excited by my acceptance and looking forward to working with me.
After over a month of not hearing anything back regarding start dates or official documents, I emailed them asking when I could reasonably expect to learn of my start date, end date, and any other dates that I should be cognizant of. They responded informing me of when my probable start and end dates would be.
However, they were also very clear throughout the application process that my internship is contingent upon successfully passing a drug test. To be clear, I'm not concerned about my ability to pass, but I have heard that this company gives people an extremely short window between when an invitation to take the test is given and when the test must be taken.
Between today and my start date I will likely be going on a backpacking trip and one or two volunteer abroad trips, during which I will almost certainly not be in places with drug testing facilities.
I fear that I may be in danger of losing the offer if I receive an invitation to take a drug test while I'm traveling and thus wouldn't be able to take it by the deadline.
How can I ask my HR representative about this in a professional way that wouldn't make it look like I'm trying to schedule my drug use around the drug testing date?