Davis, D'Elea, and Sims were former heroin or narcotics addicts. Davis and Sims were told by the city director that they could not be hired by the city because of their former habit. D'Elea was rejected from a city CETA program because of his former habit. The three sued the city, alleging that drug addiction was a handicap under the Rehabilitation Act of 1973 and that the city's refusal to hire them was therefore unlawful under this act. Were they correct in their contention?