What is the outcome if the verbal approval for a Pen register isn't followed by an order?

The requirement to obtain a formal order within a specified timeframe, such as 72 hours, is crucial in the context of using a Pen Register, as legal standards dictate the need for timely judicial oversight over any surveillance activities. When verbal approval is given, it is a temporary measure that allows law enforcement to act quickly; however, this is contingent upon securing a formal order shortly thereafter to ensure legality and adherence to due process.

Failing to obtain this order within the designated timeframe means that the initial approval loses its legitimacy, and all actions taken based on that approval could be challenged. This maintains a check on law enforcement practices, ensuring that citizens' rights are protected and that any surveillance is sanctioned appropriately by the judicial system. Hence, securing that formal order within the limit set—often 72 hours—is critical for the admissibility of any evidence obtained through the Pen Register.