In America, the 4th Amendment says that evidence cannot be used if it has been illegally obtained, so no.
It depends on what it is being used as evidence of. The text contained in the letter would probably be hearsay, so it could not be introduced as evidence of anything contained in the letter. However, certified letters are often used to show that a party had notice of something. A copy of the certified letter could be admissible to show that the person received notice.
The doctrine you are referring to is called the "attenuation doctrine." It provides that evidence collected through unlawful or unconstitutional means can be admissible in court if the connection between the illegal action and the evidence is weak enough that it becomes "attenuated" or distant. The court will weigh factors such as the passage of time, intervening events, and voluntariness of consent when applying this doctrine.
protection against double jeopardy I do not think this is a protection again Double Jeopardy as this is a person not being able to be tried for the same crime twice. It is the right to a fair and just trial. Illegally obtaining evidence can be altered (such as recording devices). Also, illegally obtaining evidence breaches a persons Human Rights set out in the European Convention for Human Rights as it would likely be a breach of their Right to Private Life (Article 8). Generally, evidence that is not obtained properly and fairly is considered inadmissible
Not necessarily. Character reference letters are usually submitted to the court as written evidence of a person's good character, behavior, and reputation. In some cases, the writer may be called to testify in court to further support the contents of the letter, but it is not always required.
The Warren Court
No, it is generally not permissible to use illegally obtained evidence in court.
No, it is generally not permissible to use illegally obtained evidence in civil court proceedings.
The exclusionary rule.
The exclusionary rule bans illegally obtained evidence from being used in court during the trial phase.
The accused has the right to challenge the admissibility of any evidence used against them at trial. Whether an e-mail or any other evidence is "illegally obtained" is subject to the interpretation of the court, not the accused. If the court rules that evidence is obtained unlawfully, it can be suppressed at trial and not considered.
Yes, it is generally permissible to use a recording as evidence in court, as long as it meets certain criteria such as being authentic, relevant, and not obtained illegally.
Mapp v. Ohio
The fruit of the poisonous tree doctrine states that evidence obtained illegally or unconstitutionally cannot be used in court, along with any other evidence that stems from it. The exclusionary rule, on the other hand, is a legal principle that prohibits evidence obtained in violation of the defendant's constitutional rights from being used in court.
If an officer were to obtain evidence illegally, such as searching you without probable cause, the evidence they acquired would not be admissible in court. That's not to say the entire case would be thrown out, but that single piece of evidence would not be allowed in court. The exclusionary rule doesn't prevent unlawful searches and seizures, but it disincentivizes them by making evidence seized unlawfully inadmissible at trial. There's no reason to illegally obtain evidence if it can't be used to convict a defendant.
To come into a home the police need a search warrant to search. Without the warrant the evidence is not admissible in court. It would be an illegal search.
In Weeks v. United States, 232 U.S. 383 (1914), the United States Supreme Court unanimously held that the warrantless seizure of items from a private residence constitutes a violation of the Fourth Amendment. It also set forth the exclusionary rule that prohibits admission of illegally obtained evidence in federal courts.See below link:
searches and seizures like 3rd amend. protect of privacy (general search warrents) evidence seized illegally without a search warrant may not be used in court.