What may have seemed like a small typo on a warrant amounted to enough reason for a judge to prevent prosecutors from using evidence collected as a result of the raid. The case involves a search of a Knox County driving school, a company operated by a retired homicide investigator.

The former murder detective, Don Wiser, has been accused of taking money in exchange for handing over certificates for having completed his driving school. The Sherriff’s Office says it raided Wiser’s office after two undercover officers went to the school and walked out with paperwork claiming they’d attended a 16-hour course when they really only spent two hours at the facility. Wiser vehemently denies the charges and says he is being targeted by the Sheriff’s department because he’s operating a competing driving school that has taken money away from the county.

So far Wiser appears to have clearly won the first round of the legal battle. His defense attorney pointed out that there was an error in the search warrant used by Knox County sheriff’s officers when they raided his business. What was the trouble exactly? The wrong date appeared on the paperwork.

The raid was carried out at his business on April 14, 2012, but the search warrant incorrectly listed the year as 2011. The Assistant District Attorney in charge of the case pointed out that there were several other places on the warrant that clearly indicated the year was 2012 and that the typo only occurred once. However, this was not enough for Knox County Criminal Court Judge Steve Sword.

Judge Sword said that while he might have agreed with prosecutors that the error was simply a typo, it did not matter because state law on the subject is clear. He said Tennessee rules left him no choice but to throw out the warrant as legally flawed. Given the flaw in the warrant, all evidence collected as a result of the warrant was also excluded as fruit of the poisonous tree.

Tennessee is one state that does not recognize the concept known as “good faith exception”. Other states and the federal system rely on the principle which says that so long as an officer has good faith in believing that the warrant he or she is exercising is valid, the evidence obtained as a result of such a good faith search can still be used.

In this case, the warrant says that the information used a basis for the search was obtained a year before the warrant was actually executed. That long of a gap makes the information too old to act on and thus an improper basis for the search.

Read: Judge: Typo on search warrant of business means it's no good,” by Jamie Satterfield, published at KnoxNews.com.