Roy Larson (John Wesley Shipp), the macho-man partner of Janice Licalsi (Amy Brenneman), is suspected of using steroids and ordered to take a drug test. Assistant DA Sylvia Costas (Sharon Lawrence) carries a torch for Sipowicz (Dennis Franz), but he continues to keep his distance. The death of an informant causes trouble for Roberts (Michael Harney) -- and, later, for Martinez (Nicholas Turturro) and Medavoy (Gordon Clapp). And Laura (Sherry Stringfield) wants to re-open a tricky murder case, much to the dismay of her ex-husband, John Kelly (David Caruso). ~ Hal Erickson, Rovi