Virginia lawmakers will return to Richmond today to find a legislative fix for a U.S. Supreme Court ruling that has frustrated prosecutions in drunken-driving and drug cases and sharply increased pressure on forensic scientists to appear at trials.

Hopes are dim, however, that a single day of legislating can fully undo the headaches caused by June’s Melendez-Diaz decision, which said prosecutors must make analysts available in court to be cross-examined on lab results. The vastly increased demand for the experts already has caused some cases to be thrown out.