A U-S Supreme Court ruling is challenging Florida's ability to execute criminals who claim mental disabilities. And it could impact a case here in Jacksonville. 20-year old Shelby Farah was murdered last July while working at Metro PCS in Brentwood. Police have charged James Rhodes with first degree murder in the case, and prosecutors are seeking the death penalty. But that could turn out to be easier said than done. Channel 4's Ashley Harding joins us now live to explain ... Ashley? 3 3 Here in Florida, people with IQ scores above 70 are - not allowed - to claim a mental disability. But today the US Supreme Court ruled that in borderline cases - states have to look at more than I-Q scores to determine if the person is indeed - intellectually disabled - a classification that would keep the state from being able to execute them. 3 00-05 14-19Supers: Darlene Farah/ Daughter murdered last yearTRACK Here at the Families of Slain Children....Darlene Farah looks at the wall and sees her daughter Shelby's name near the top. Shelby Farah was shot and killed during a robbery at the Metro P-C-S store on North Main Street last year.07:13--07:28 "i've been here for most of the day. And a lot of people was coming in here and everybody that walked through that door knew Shelby. And when they saw me, and it was just---unbelievable."TRACK Prosecutors have charged this man, James Rhodes, with first degree murder in the case and they're seeking the death penalty.But last week Rhodes' attorney filed a motion saying Rhodes is "intellectually disabled". The Supreme Court ruled Tuesday that if a defendant's IQ is between 70 and 75, more factors would come into play to determine if he or she could be executed. Rod Sullivan is a professor at the Florida Coastal School of Law.14:10--14:31 "all of these things become relevant to somebody whose IQ is between 71 and 75.Their upbringing, whether they were subjected to child abuse, whether or not they were able to hold down a job, past performance in their environment. All of these things become relevant now to this decision."TRACK Some death penalty opponents applauded the ruling, but other people - like Darlene Farah--believe IQ shouldn't matter at all.04:47--04:54 "what it boils down to is knowing what's right and what's wrong. Especially if you're charged with premeditated murder."TRACK No matter what happens in the case, Farah's mother says she has faith in the system. 05:32--05:42 "I just put it in God's hands. I feel very confident that everything is going to work out. Whatever the outcome is, I have to accept it." 3 James Rhodes is due back in court in July. As of now, his trial is scheduled for August. Reporting live, AH, CH 4, TLS. 3 Ashley, when you spoke to Rod Sullivan - did he say if this could impact other death row cases?