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No, evidence obtained illegally, including letters that were opened without permission, is generally not admissible in court due to the exclusionary rule, which prohibits the use of illegally obtained evidence in legal proceedings.
The Exclusionary Rule's purpose is to keep certain evidence from being used against you in a criminal trial. Police procedure in gathering evidence against you is heavily dictated by cases interpreting the Fourth Amendment. Evidence gathered in violation of your Constitutional rights is subject to the Exclusionary Rule.
This statement is based on a person's constitutional right to protection against unreasonable search and seizure, as outlined in the Fourth Amendment of the U.S. Constitution. It aims to prevent law enforcement from violating individuals' rights by obtaining evidence through unlawful means.
Mapp rule
There are many arguments for and against DNA evidence. One argument is that it cannot be disproved as deciding evidence.
Any evidence obtained as a result of that search is null and void in court or hearings, and the officials concerned may face disciplinary action for misconduct.
Police searches of your home are not legal uness they have a warrant, which has to be signed by a judge. If the police want to search your home, and they do not have a warrant to do so, then you have the right to refuse to let them search your home. If they do so without a warrant, and without your permission, then anything they find cannot be used against you, since the evidence was obtained illegally.
The general doctrine courts follow is called "fruit of the poison tree." If a defendant's rights were violated, then any evidence deriving either directly or indirectly from that violation is inadmissible in court. The violation "poisons" the evidence obtained illegally and any other evidence discovered as a result. It is not, however, a "get out of jail free" card. If the police illegally search your home without a warrant and find heroin there, they cannot use that as evidence. They can, however, use the surveillance video taken of you two weeks ago showing you selling heroin in the park that made them want to search your home in the first place as evidence.
The attorney has the ethical responsibility to protect his client. He cannot divulge anything told to him in confidence. He cannot testify against the client, he cannot provide information or evidence to the police or prosecution. The most he can do is excuse himself, and that if done in the wrong way is a violation of trust and ethics and could be grounds for removal from the bar.
The obtained evidence will probably be ruled inadmissable in court. This is known as the "Fruit of the Poison Tree" doctrine, which also applies if evidence that was legally obtained was from an illegal search or illegal source.
In certain cases in could but in a general term no it cannot, poorly collected evidence could contaminate it or even if obtained wrong could be thrown out and not be used as evidence that is why there are procedures to be followed.
A search cannot be conducted without a warrant, which cannot be obtained without evidence of reasonable suspicion. This reasonable suspicion is often referred to as probable cause.