In the middle of the episode, the scientist bicycles up to report, dramatically, that the tests "were inconclusive".
In the end, it's revealed that the bones were a fraud concocted by some mall developers to promote their new mall.
After this is revealed, Lisa asks the scientist about the tests. He shrugs:
"I'm not going to lie to you, Lisa. I never ran the tests."
It's funny on a few levels but what I find most amusing is that his incentive is left a mystery.