LEWISTON — In response to stalled contract negotiations between the city and its police union, Lewiston officers will wear alternate uniforms while on the job to express “dissatisfaction” with the situation. Corey Jacques, president of the Lewiston Maine Association of Police, announced the action late Tuesday, with city officials responding early Wednesday, threatening disciplinary action. Jacques, a Lewiston detective, said in a statement that negotiations are ongoing with city administration to resolve the issue.