MANDAN, N.D. — A judge will allow in court evidence against a chiropractor accused of killing four people at a Mandan business last year.

In a July 9 opinion, Morton County Judge David Reich denied Chad Trolon Isaak's attorneys' motion to suppress evidence and a request for a hearing to determine if law enforcement intentionally used false information to obtain a search warrant.

Isaak, 46, has been charged with four Class AA felony counts of murder, one each for the April 1, 2019, slayings of RJR Maintenance & Management co-owner Robert Fakler and employees Adam Fuehrer, Bill Cobb and his wife, Lois.

Investigators say Isaak is the masked man caught on camera driving away in a white pickup from the RJR building. Authorities used cellphone location data to find who was in the area at the time of the murders. A McLean County Sheriff's Deputy, who was a patient at Isaak's chiropractic business in Washburn, N.D., also recognized the white pickup as belonging to Isaak.

Authorities obtained a search warrant and found blood in Isaak's vehicle. He was arrested several days after the fatal shootings and stabbings at the business that manages the Washburn mobile park where he lives.

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If convicted, Isaak faces life in prison.

The defense argued officers used false information to obtain a search warrant for Isaak's vehicle, which led to finding evidence that prompted officers to seek out more search warrants for other property he owns. Officers said the suspect in the pickup was wearing dark clothing when video shows bright clothing, the defense said in court documents.

Reich said video shows some of the clothing worn by the suspect was dark, while other articles were bright.

There were other statements authorities used to obtain the initial warrant that the defense claimed were false. Attorneys argued Isaak had a right to a Franks hearing to determine if that was the case.

Reich opined that the defense did not meet the burden to prove investigators deliberately lied to get the warrants. He also found that the statements the defense claimed to be false were not necessary for officers to obtain a search warrant, as there were other factors used for the legal search.

Isaak's jury trial is set for Nov. 30.