Pen register; bring forward provision that regulates.

HB 1644 clarifies definitions for phone surveillance tools used in drug investigations under Mississippi law. It updates terms like "pen register" (a device recording outgoing calls) and "trap and trace device" (tracking incoming calls) to align with current technology. The bill requires law enforcement (specifically the Bureau of Narcotics) to obtain court approval with evidence of a drug crime before using these tools, sets 30-day limits for their use, and mandates annual reports to the courts on their deployment. It does not change investigative practices but ensures definitions and procedures are current for felony drug investigations.