The SDLP's Pat Ramsey spoke of how he lost his younger brother and sister-in-law in 1995 in an accident caused by a drink driver.

BBC: Driving under the influence

Under the new laws, even one medium-sized drink can land a driver in trouble.

ECONOMIST: New laws on drink and smoking

Today, Americans expect the "designated driver" to social events where alcohol is served will not drink, but 25 years ago, before Harvard's "The designated driver is the life of the party" campaign, this was not the case.

CNN: Ethicist: Health bans and 'sin taxes' can easily backfire