NSW MP caught drink-driving: Stoner

A NSW parliamentarian has been caught drink-driving, the state's deputy premier says.

"Earlier today, I was informed that the MP for the Northern Tablelands, Adam Marshall, was last night caught driving under the influence of alcohol," NSW Nationals leader Andrew Stoner said.

"I have since expressed to Adam my disappointment with his actions, and reiterated the high standards that I expect of all our MPs."

Mr Marshall is not the first Tablelands MP to attract scandal.

He claimed the seat at a 2013 by-election sparked by the resignation of Richard Torbay, who held the Northern Tablelands as an independent for 14 years.

Mr Torbay resigned last March - a day after the Nationals dumped him as their candidate for the federal seat of New England.

He was subsequently referred to the NSW Independent Commission Against Corruption because of his relationship with crooked ex-Labor powerbroker Eddie Obeid.

Mr Stoner said Mr Marshall had resigned as temporary Speaker and Deputy Chair of the State and Regional Development Committee.