Two Texas members of the US House are demanding answers from Dallas and Tarrant county officials about the 1,800 unclaimed bodies donated for medical research without family consent.

On September 16, NBC News published the findings of a 10-month investigation in the University of North Texas Health Science Center and its failure to comply with state law requiring death investigators to make a “diligent investigation” to find a next of kin.

U.S. Reps. Jasmine Crockett, D-Dallas, and Marc Veasey, D-Dallas, sent a letter on Wednesday at the coroner’s offices in Dallas and Tarrant counties, challenging policies on handling unclaimed remains.

The letter included a series of questions that, according to the letter, seek to find out why the families were not notified and how the school plans to remedy the harm caused. He requested answers from the representatives of both counties by November 30.

According to the letter, the unclaimed remains were cremated and then buried in local cemeteries or scattered at sea, saving the counties involved half a million dollars in burial and cremation costs.

Lawmakers expressed additional concern over the body of U.S. Army veteran Victor Honey, whose remains were donated to the university without notifying his son, who lives in Dallas.

Under federal law, veterans and their dependents are entitled to certain burial benefits, such as funding to assist with burial and relocation in Virginia cemeteries, the letter explained.

“By failing to contact Mr. Honey’s family, he has been deprived of the rights he has earned by bravely serving our country,” Crockett wrote.

The letter listed the changes to UNT’s Health Sciences Center NBC investigationincluding the suspension of the cadaver donation program, a temporary moratorium on all out-of-state cadaver shipments, and the suspension of several termination contracts.

In addition, Tarrant County has issued a new policy detailing how it will handle future unclaimed remains.

However, Crockett said these changes offer no guarantees to prevent recidivism.

“While we welcome these changes, they do not erase the hurt and pain that thousands of families feel as a result of the failures detailed in the NBC investigation,” she said.