Wichita ? Defense lawyers for Reginald and Jonathan Carr rested their cases Wednesday without either brother taking the stand.

Jay Greeno, attorney for Reginald Carr, told the judge his client was going to exercise his right to remain silent.

No witnesses testified at the trial for Jonathan Carr, and the only evidence presented in his case was documentation of a train ticket for the ride he planned to take out of Newton the day four people were shot and killed. The Carrs are accused of killing those four people and another woman.

A total of 97 witnesses have testified, including five for Reginald Carr. More than 800 pieces of evidence have been admitted.

Jurors will hear about an hour of jury instructions today. Then the prosecutor and each brother’s defense team each has two hours for closing arguments.

Testimony Wednesday came from the defense’s DNA expert, Jami Harman, of Genetic Technologies Inc. of St. Louis. She testified about seeming discrepancies in the descriptions police investigators recorded of some of the evidence used to collect DNA samples. She also questioned the accuracy of some of the DNA profiles that contained mixed DNA samples from two or more people.

But on cross-examination by Deputy Dist. Atty. Kim Parker, Harman acknowledged she never actually did DNA tests on some of the most incriminating evidence against Reginald Carr the red undershorts and the shirts spotted with one victim’s blood that were found in his apartment when he was arrested.

In fact, Harman testified, she never even opened the evidence bags containing those items.

Harman acknowledged her company, which works on civil cases such as paternity testing, is not certified as a law enforcement crime lab and does not have access to some of those databases.

The woman also told jurors she had never even seen her company’s Web site. She also said the company and its seven employees are based in the same rural acreage where her home is located.

In addition to other charges, prosecutors say that on Dec. 14-15, 2000, the brothers abducted five friends from a Wichita home, forced them to engage in sexual acts and to withdraw money from ATMs before the five were shot. Aaron Sander, 29; Brad Heyka, 27; Jason Befort, 26; and Heather Muller, 25, died. Befort’s girlfriend, then a 25-year-old teacher, survived and ran for a mile to find help.