https://apnews.com/21eb8bcfc6fa4697a9dda829c1f5fc74

OKLAHOMA CITY (AP) — Thousands of illegal cellphones are making it into the hands of prison inmates who use the devices to commit crimes, but prison officials say they're prohibited from using one of the most effective tools to stop it — jamming technology.

Prison officials from Oklahoma and South Carolina both testified before an Oklahoma Senate committee on Monday that cellphone-jamming technology was one of the best ways to stop the use of cellphones by inmates.