Louisiana State Police Supt. Col. Mike Edmonson speaks during an interview Wednesday, March 15, 2017 at LSP headquarters. 

A former head of the Louisiana State Police is accused of deleting text messages amid an investigation of allegations that troopers improperly billed for thousands of dollars in overtime and expenses during a road trip, according to a newly released police report.

Before his retirement in March after nine years as state police superintendent, Mike Edmonson publicly condemned a pricey side trip to Las Vegas that several troopers took during their drive to a law enforcement conference in California last October. Edmonson claimed he hadn't approved the side trip.

But a state police report, obtained by The Advocate through a public records request, says cellphone records show Edmonson was in contact with the troopers throughout their trip and received photographs of them sightseeing at the Hoover Dam in Nevada.

The report also says Edmonson took a cellphone from Rodney Hyatt, a trooper who had been on the road trip, and altered its settings so it would purge any text messages older than 30 days.

However, investigators recovered text messages (seen below) from a cellphone belonging to Hyatt's wife. They showed Edmonson stayed in contact with troopers during their cross-country drive.

To view Edmonson's messages, click here.