The City of Snyder is in Scurry County and it's where BD and SA worked. It's also where BD's mother and brother live as well as other friends and relatives. Scurry County is a short distance up highway 208 from Mitchell County where Colorado City is located. Dunn is also a town in Scurry county and is located on Hwy 208 between Colorado City and Snyder.
So yes, she withdrew the money and bought the illegal narcotics in "Scurry County", which is another way of saying Snyder IMO. I don't understand why LE were tagging these areas by county instead of by the town or city. We've got 4 towns or cities in 3 different counties (Big Spring is in Howard County) involved here but they are not that far apart. Perhaps they figured they would get a better response on the polygraph by using a general area instead of a specific area.
HTH