In addition to the minimum legal requirements, limousine companies often require their chauffeurs to undergo specific extra training. These courses may involve evasive driving or
defensive driving techniques, the proper methods to ensure safety in the most extreme conditions, such as inclement weather, a flat tire at high speeds, or other exterior influences for loss of vehicular control, etc. Many companies also have courses on what they expect from their chauffeurs. Chauffeurs may be taught proper
etiquette when they are in the presence of their
clientele. They may also be trained for services to the client beyond the car itself, such as for a personal
valet or
bodyguard. Many companies and local licensing agencies require random
drug screening for chauffeurs. There have been increased requirements for compliance in drug and alcohol testing in the United States. The problem was highlighted after professional
ice hockey player
Vladimir Konstantinov's career-ending injuries when his recently hired chauffeur, Richard Gnida, lost control of their limousine and crashed. Another concern are company drug and alcohol policies for chauffeurs in those states where marijuana is legal because of the potential impact and impairment to perform their job safely and effectively. ==Notable chauffeurs==