The jury in the trial of a Roscommon post master accused of perverting the course of justice by tampering with a urine sample in a drunk-driving case has been sent home for the night.

The jury of six men and six women had deliberated for four hours and 19 minutes before returning to tell the judge at a Roscommon Circuit Court that they had failed to reach a verdict.

Earlier, Judge Tony Hunt had advised the jurors they could reach a majority verdict if they wished.

Kevin Rogers of Mote Park, Roscommon has pleaded not guilty to a single charge of doing an act intended to pervert the course of natural justice by interfering or tampering with potential evidence on 5 March 2012.

During a trial which began last Thursday, the jury has heard allegations that Mr Rogers took a urine sample which had been posted to the Medical Bureau of Road Safety and placed it in a microwave at Roscommon Post Office.

The jury will resume deliberation at 10.30am.