Police pulled over a Wisconsin state legislator Wednesday night and arrested him on suspicion of operating while under the influence of a controlled substance, according to the Wisconsin State Patrol.

According to the report, a state trooper stopped Rep. Jeff Wood, I-Chippewa Falls, at about 6:30 p.m. on State Highway 50 just south of Wausau after a witness called 911 to report a car driving erratically on the road.

The report said Wood explained his irregular driving by saying he was looking for a spot on a map while driving. Another trooper on the scene searched Wood and found a bottle of Lorazepam, a drug commonly used to treat anxiety, in Wood’s jacket with only seven of the original 45 pills left in it. The prescription was filled Tuesday.

The troopers took Wood to a local hospital to have his blood drawn, and he admitted to taking twice the daily dosage of his prescription and two doses of nighttime cough syrup.

If charged, this would be Wood’s fourth time OWI, with the most recent one being in January.

The state Assembly recently passed harsher penalties for OWI drivers, including criminalizing a fourth offense OWI.

Wood, along with the rest of the Assembly, voted in favor of the harsher punishments.

“The Assembly took meaningful action last week to tackle the issue of drunken and impaired driving in Wisconsin, approving both tougher penalties and more treatment resources for those who get be-hind the wheel while intoxicated,” Assembly Speaker Rep. Mike Sheridan, D-Janesville, said in a statement.

Sheridan added he was troubled by Wood’s arrest and said he is closely monitoring the updates and details of Wood’s case.

Mark Jefferson, executive director for the Republican Party of Wisconsin, said in a statement Wood’s personal problems are impairing his role as a representative of the people of Wisconsin, and said Wood should resign his post as a Representative.

“Sadly, Rep. Jeff Wood continues to endanger the health and safety of himself and others,” Jefferson said in the statement. “I share the concerns that many have for him personally and hope he gets treatment, but enough is enough.”

Correction: The original headline stated Rep. Wood was charged with an OWI. He has only been arrested on suspicion of an OWI and has not yet been charged. The article has been changed to reflect that fact.