Authorities plan to crack down on impaired drivers – either drunk or under the influence of drugs – using new DUI technology this New Year’s holiday. A state grant will allow Los Angeles police officers to expand its use of swab testing at DUI checkpoints and jails to check for narcotics use, city officials announced at a press conference on Friday.The grant comes at an opportune time as authorities said they are seeing more incidents of motorists driving under the influence of marijuana and other drugs. Los Angeles City Attorney Mike Feuer said the prevalence of medical marijuana dispensaries throughout...