WASHINGTON — It started with a bottle of orange juice 30 years ago. The national legal standards that govern when police officers are justified in using force against people trace their lineage to a 1984 case from Charlotte, N.C. In that case, a diabetic man’s erratic behavior during a trip to a convenience store for juice to bring up his low blood sugar led to a confrontation with officers that left him with injuries from head to foot. Dethorne Graham’s subsequent lawsuit against police for his …