If they did find Suzanne’s body, would it matter legally how it was found? I’m hoping you mean people might be fined for trespassing, but the FINDINGS would still be in play legally for prosecution of Suzanne’s murder. But I don’t know? Yikes!
It really depends on which property one is discussing.
I. Property owned by Barry
If -- as reported by the
Daily Mail ** -- the dogs "hit" on something in/on Barry's property, then that fact (the "hit")
may be used in a probable cause affidavit to attempt to obtain a warrant.* The purpose of the exclusionary rule (suppressing evidence) is to "punish" the government for unlawful actions. For example, if an officer who goes into a home without a warrant, conducts a search, and finds cocaine, the cocaine could be excluded from evidence because the government agent (the officer) committed an unlawful act (a search without a warrant). Here, however, it can be argued that the police did nothing wrong: the volunteers did. The "punishment" of exclusion would serve no purpose, since the police's actions were not unlawful.
However, if the defense can
connect the police to the volunteers, then the volunteers may be considered
agents of the police. This would mean that the government did violate the law: it caused its agents to search Barry's property without a warrant. Because there was no warrant, the search would be
presumed to be unlawful.
II. Property not owned by Barry
This search is less of a problem. Barry has no expectation of privacy in a property owned by another person, so it's doubtful that he can attempt to have any evidence obtained there excluded. A person can only challenge a search as unreasonable if he has "standing," which is a reasonable expectation of privacy in the place that is searched.
Note that even if any evidence obtained due to these searches is admitted, the defense can still argue that the evidence was planted, especially if the property was already searched by investigators at a prior time and nothing was found.
* I have no idea if -- in Colorado -- a "hit" from a cadaver dog, in and of itself, would provide probable cause for a warrant. I also do not know whether police would have to include any information about the cadaver dog's training and experience in the affidavit.
** The Daily Mail's track record with regard to accuracy is not spotless, so this exercise may be academic only.