Then that evidence is inadmissible in court, there is no grey lines here, all other evidence must be looked at as highly suspect or thrown out all together and The case dismissed. This isn’t even first year law school stuff, it’s the basics you learn in pre-law studies while getting familiar with the law library and basic case law research. I remember my professor giving us the facts of a case and spending hours in the law library forming legal arguments and researching case law precedent. I was pretty good at it actually and made some legal arguments that surprised my professor.