Originally posted by BlackCat
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First, hearsay is an out of court statement introduced to prove the truth of the statement. The basic reason that hearsay is inadmissible is that the best evidence of the truth of the statement is testimony by the person who made the statement. A second hand account of "A told me X" is not as reliable or probative as a first hand account by A that "X is true." Basically, if you can't get the person with personal knowledge to testify that something is true, the court won't let you get somebody that person talked to about it to say that it's true because the first person told them so.
Second, there are a number of exceptions which make hearsay admissible. One of these is the "admission by party opponent/statement against interest" exception, which is where the interview with the cop falls. If you admit to something against your interest, it's considered more reliable for the very fact that it's against your interests. It therefore becomes admissible. Note here that we aren't considering how much weight to give the statement. The trier of fact, judge or jury, can still dismiss it as false based on other circumstances. All this exception says is that if you make a statement that is against your interests, the trier of fact can consider that, even if it comes from someone else in court. It's admissible, not necessarily determinative.
Think about it this way: if A sues B for $500, would you, as a juror, be more inclined to believe A if C says "A told me B didn't really owe him any money," or "A told me B owes him money"? In the first case, C may be giving some insight into the matter, but in the second case, C is only parroting what we already know A is claiming, and will say himself.
It's the same thing with the police. Anything you say to them that may be a defense argument is something you can say on the stand yourself. No value is added by having the cop say "Yeah, that's what he told me, too." On the other hand, you saying X on the stand, and the cop saying "well, he told me Y" raises questions of your credibility as a witness, and is therefore fair game for jury consideration. That's in addition to the whole "If saying Y would put him in jail, why would he say Y unless it was true" aspect, which isn't foolproof, but is good enough for admissibility purposes.
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