People play with fire everyday they know the law and the risk, sometimes you win and sometimes you lose. Impaired is impaired. It can be from sleep deprivation, too much alcohol, your wife just left you, prescription or over the counter drugs or whatever. You can legally have a couple drinks and still drive. As a mature adult you use your best judgment to decide. You can also drive after smoking but they say you should wait 4 hours wink wink for those of you that think you can handle your weed. Anyways, cops are apparently trained to look for impaired drivers so either you pass their tests or your don’t. It’s pretty simple if you ask me it’s been like this for ever. Ya sometimes cops make mistakes too but that’s for the judge to decide if they’ve got sufficient evidence.