I know that this is an old thread, but recently in one of my classes, the professor (of law, obviously) explained the law regarding a situation like this one. As it turns out, Wakka Wakka was right. Because it was Space Cowgirl's rights being violated, not mine, I do not have the legal standing to challenge this search. Now, if it were Space Cowgirl on trial for something, for example, if she deliberately hid the murder weapon for me, then the evidence would be suppressed.