An Arkansas doctor charged with illegally owning grenades has pleaded not guilty as his defense lawyer argued to have his case dismissed.

Randeep Mann's lawyers submitted a not guilty plea on his behalf Tuesday to one felony charge that accuses him of owning 98 high-explosive grenades found in the woods near his home.

But lawyer Blake Hendrix also filed a motion to dismiss the case, saying the 50-year-old's right to a speedy trial has been violated. Hendrix says 36 days have passed between Mann's arrest and his indictment, which breaks a 30-day limit set in federal law.

U.S. Attorney Jane Duke did not immediately return a call for comment Tuesday.

If convicted, Mann faces a maximum sentence of 10 years in prison and a $10,000 fine.