Do the feds exercise any boundaries in spying on people's cellphone use?

Defending cases, felonies and misdemeanors. Fighting tirelessly for the best possible results for his clients. https://katzjustice.com

Does the federal government exercise any boundaries in spying on people’s cellphone use? If yes, then why is the federal government using fake cellphone towers to track suspects’ calling activities?

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A truly fierce advocate for his clients
I am fellow lawyer in the community and Jon is a truly fierce advocate for his clients who has zero fear of taking on the government. Having watched Jon in court, I have also seen that he is meticulous in his preparation and possesses a real knowledge of the law. Unlike many criminal defense attorneys, he engages in critical pretrial litigation that aids in winning cases or achieving better negotiated results. I have no hesitation in endorsing him.
Joe King
Source: Google
A very experienced and very knowledgable criminal defense and DUI attorney
Jon is a very experienced and very knowledgable criminal defense and DUI attorney in our area. He shared a lot of his expertise with our team as he is big on public education about the criminal law process. We would highly recommend Jon and his team
Ben Glass
Source: Google
An exemplary attorney and a master of the legal craft
Jon Katz is an exemplary attorney and a master of the legal craft. No one could stop Jon from achieving results, defying the odds, going beyond what is possible. He cares deeply about clients he represents, their families and his colleagues taking their personal and professional success as it were his own. Jon Katz and his team make this world a better place, one day at a time.
EK
Source: Google

Do the feds exercise any boundaries in spying on people’s cellphone use?