The lawyer for the Frisco mother accused of murdering her 10-year-old son is asking the FBI and the Texas Rangers to investigate.
The moves comes a day after a judge ruled Frisco police do not have to return Sumeet and Pallavi Dhawan's SUV. It was seized two months ago after their son Arnav's body was found in their home.
Frisco police removed the vehicle's hard drive, claiming it may be used as evidence.
In a letter sent to the Frisco mayor, the police chief and the Collin County District Attorney, the Dhawans' attorney says he believes Frisco Police Department has a grave conflict of interest in this case.
To that point, the attorney says he will not let Pallavi Dhawan be questioned by Frisco police, but he will make her available for questioning by the FBI.
The medical examiner ruled Arnav's cause of death as undetermined.
KDFW FOX 4
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