Pharmaceutical companies scored a major victory on Monday when a divided U.S. Supreme Court held that the industry’s sales representatives are not eligible for overtime pay.

The court, ruling 5-4 in Christopher v. SmithKline Beecham , found that the estimated 90,000 drug sales reps fell within the so-called “outside salesman” exemption from the minimum-wage and maximum-hours requirements of the Fair Labor Standards Act (FLSA).