Is it legal to bribe your employees to be healthy? Wouldn't that violate the Americans with Disabilities Act, or the Genetic Information Nondiscrimination Act, or something?

In other words, is it legal any more for an employer to offer incentives -- like, money? -- to employees to participate in "voluntary" wellness programs?

The Bureau of National Affairs has obtained and released an opinion letter from Peggy Mastroianni, legal counsel for the Equal Employment Opportunity Commission, addressing these questions.