I successfully completed academy training at the California Highway Patrol Academy (graduated March, 1983 at Bryte, Calif.) and later graduated August, 1985 (Brunswick, Georgia) at the United States Border Patrol Academy on the FLETC campus (Federal Law Enforcement Training Center). Both courses included "enforcement driving" on either flat tracks or banked track.
At the CHP academy, one skill taught/practiced was high speed driving a patrol car in reverse, but in a straight line. The academy cadet that attained the highest speed/score (approx. 60 mph) was a former long-haul truck driver. Unfortunately, that same cadet was dismissed before graduation for not having passed the academic requirements (for example, not having completed at least a score of 70% on all examinations).
If the Secret Service video were true-to-life, the driving would have been performed by one of the Secret Service academy instructors. However, I don't believe the limo (which probably weighs twice an average passenger car) has the performance/handling characteristics necessary for such a feat.