The Arkansas Ethics Commission received a report from a staff investigator that found twelve violations of state statutes related to campaign spending.
Liberal blogger Matt Campbell filed the ethics complaint against Darr after reviewing 2010 campaign expenditure filings.
Darr subsequently filed a complaint against himself to the Arkansas Ethics Commission after he said he became aware of mistakes.
A closed door hearing lasted approximately thirty minutes.
Darr, who has not decided if he will run for reelection in 2014, did not answer questions Wednesday about the hearing but said he would not resign.
"We're going to comment later," Darr says.
The Arkansas Ethics Commission will now take the investigative report and determine if there is probable cause to issue any sanctions against Darr.
Attorney Dan Greenberg, himself a former legislator, is representing Darr in the ethics investigation.
"He apologized to the commission for mistakes he's made and expressed regret for them," Greenberg says. "He'll have a further statement after a final disposition of the complaint."
Former state senator Paul Bookout, D-Jonesboro, resigned in August after the commission fined him $8000 for misuse of campaign donations for private purposes.
Darr withdrew from the race for Congress in the 4th District earlier this year after questions surfaced regarding campaign expenditures.
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