Katz v. United States is the answer 100 %
Electronic "eavesdropping" at BOTH the federal and local levels is limited by the necessity of having a warrant issued by a judge after finding of probable cause to issue it. Without a warrant nothing gained by the electronic interception is admissable in court.
The U.S. Supreme Court.
Kurt William Haase has written: 'An analysis of the methods and techniques of electronic eavesdropping and countermeasures' -- subject(s): Wiretapping, Eavesdropping
Yes.
About the NSA's system of eavesdropping on worldwide electronic messages.
The Electronic Communications Privacy Act (ECPA) regulates the interception of electronic communications, including eavesdropping on message contents. This law prohibits individuals from intercepting, disclosing, or using electronic communications without proper authorization. Violating the ECPA can result in both civil and criminal penalties.
The Electronic Communications Privacy Act (ECPA) of 1986 was enacted to prevent unauthorized eavesdropping and interception of electronic communications. It established legal standards for government access to electronic communications and set guidelines for the surveillance of private communications, including telephone calls and emails. The act aimed to protect individuals' privacy in the digital age as technology evolved.
people can phone us tell to what you are wearing.if you in bed they say how or what part of the house you in
placing a high tech device in a location to have access to what goes on there (also called "bugging")
Robert S Mueller has written: 'Electronic surveillance manual' -- subject(s): Handbooks, manuals, Electronic surveillance, Eavesdropping, Wiretapping
No it does not. Though it did appear to crack down on unauthorized eavesdropping, there are still many ways government agencies can get around this law to get personal information.
The question is too broad and too general to answer. There are multiple statutes covering these acts, primarily federal but also some state. Some or all are applicable depending on the specific scenario of the offense and which jurisdiction chooses to prosecute.