As a c/o, if you head out on your SDR and detect you have surveillance, you are not likely to make your original meeting, but instead, will change your plans. What you hope you don’t do is let surveillance know that you have detected them, thereby betraying that you are surveillance aware, and thus a likely intelligence officer. You want to lull them into a sense of complacency.
So, after grabbing supplies, some light disguise materials, and a pile of cash, I headed out on an extensive surveillance detection route (SDR). The details are irrelevant, but, with the traffic in that city and tools and training I had, I was 100% certain I was black (surveillance free).