Yes, you can't use evidence that was obtained illegally to prosecute someone for a crime. Their guilt or innocence has nothing to do with it.
If illegally acquired evidence was admissible in court, the police would have every incentive to ignore people's rights on a regular basis, conducting illegal searches and seizures, breaking into homes without a warrant, etc., in order to obtain evidence. On balance, this is much worse for society than one guilty person going free.
Yes, you can't use evidence that was obtained illegally to prosecute someone for a crime. Their guilt or innocence has nothing to do with it.
If illegally acquired evidence was admissible in court, the police would have every incentive to ignore people's rights on a regular basis, conducting illegal searches and seizures, breaking into homes without a warrant, etc., in order to obtain evidence. On balance, this is much worse for society than one guilty person going free.