There was also a personal anecdote from the DUP's Jimmy Spratt who recalled witnessing a fatal collision where the driver responsible had been drinking.

BBC: Driving under the influence

In fact, a recent survey of teens revealed that while 87 percent of teen passengers would speak up to ask a driver to refrain from getting behind the wheel after drinking, only 72 percent of teen passengers would do the same for a driver who has used marijuana.

WHITEHOUSE: Drunk and Drugged Driving: Not an Acceptable Part of Life

The driver who killed her had been drinking, taking painkillers, and was blind in one eye.

FORBES: Woman Convicted of Homicide After Drunk Driver Kills Her Child