What type of evidence is considered inadmissible in court?

Hearsay evidence is considered inadmissible in court because it refers to statements made outside of the court that are presented as evidence to prove the truth of the matter asserted. The key issue with hearsay is that the person who made the original statement is not present in court to be cross-examined, which raises concerns about the reliability and credibility of the information. The legal system values the opportunity for both sides of a case to challenge evidence and the credibility of witnesses, so hearsay does not meet this standard. Instead, courts often allow for firsthand witness testimony, expert analysis, and documentary evidence as they involve direct involvement or observation by someone who can be questioned regarding their knowledge and the context of what they are presenting.