Here you can find your own jammer

"Prior to this incident, I had not paid much attention to signal jammers," Robinson remarked, reminiscing about a June event when a thief's signal jammer hindered police communication during a burglary. The device was located in the back seat of the perpetrator's vehicle and was capable of disrupting signals over a distance of one mile.
Sheriff warns of thieves using "signal jammer" devices to disarm cameras, alarms
Signal jammers, which are diminutive electronic devices intended to obstruct wireless communications, have become a significant concern for law enforcement. Sheriff Noah Robinson recently testified before an Indiana study committee about the potential dangers associated with these devices.
While the precise name of the device has not been officially confirmed by authorities, it is acknowledged to interfere with Wi-Fi and other radio frequencies, posing significant risks. The use of signal jammers is forbidden in prisons because of their disruptive effects on communication, yet they can still be found for sale on the internet.
According to Robinson, the presence of these devices grants burglars a considerable edge, as the existing technology is rendered ineffective. He raised concerns that the implications of these devices could extend to the security of hospitals, law enforcement agencies, and airports, and may be exploited for terrorist purposes.
Presently, federal regulations impose restrictions on the use of these devices, yet local law enforcement remains confronted with challenges. Robinson recommended that lawmakers establish a criminal offense for the importation and utilization of signal cell phone jammer, highlighting the importance of implementing harsher penalties.
As the conversation progresses, there is an increasing call for the establishment of new legislation to officially regulate signal jammers, thereby ensuring the protection of critical communication infrastructures.