SANTA CLARA, Calif.—In a virtual international press conference on June 2, drug experts voiced their concerns about what will happen if a California bill to allow drug injection sites is passed. Senator Scott Wiener introduced California Senate Bill 57, also known as the Controlled Substances: Overdose Prevention Program, last December. If the bill is passed, it will be permissible to set up sites for people to legally use illegal drugs under medical supervision, especially in San Francisco. The bill states that drug overdose “has been the leading cause of accidental death in the United States and in California each year since 2011.” SB-57 states that overdose prevention programs, or OPPs, “are an evidence-based harm reduction strategy that allows individuals to consume drugs in a hygienic environment under the supervision of staff trained to intervene if the individual overdoses.” However, some drug experts say the program would likely do more harm …