A former Hartford chiropractor has been sentenced on child pornography charges.  A Minnehaha County judge sentenced 32-year old Joel Martens to ten years behind bars on Tuesday. Martens also pleaded guilty to sexual exploitation of a minor and sexual contact with a child by a person in authority.  Martens was given suspended sentences for those crimes, and he will have to register as a sex offender. Martens was initially arrested in July of 2023 for having sexual contact with the girl in 2021 at Lemke’s Fitness and Training in Hartford, she was 16 at the time.