Look,
Both the LSAT and the MCAT are, to varying degrees, intelligence exams. But they differ in one important respect, which is that the LSAT is EXCLUSIVELY an intelligence examination, while the MCAT requires both smarts AND knowledge.
This distinction makes a difference in this sense: The LSAT does not generally produce false positives or negatives. On the other hand, the MACT CAN produce a false negative (ie, even smart people can do poorly on it).
As has been mentioned before on this thread, the LSAT consists of three types of questions, reading comprehension (like the MCAT, though in my opinion not as difficult), "short" logical vignettes (sp) and the "games" section.
The games section seperates the wheat from the chaffe. It consists of questions like this:
"Six friends sit around a round table with eight chairs. Bob sits next to Tim. Alice sits next to Ed. Ed does not sit within three places of Tim or Bob, blah, blah, blah. . .Now answer the following ten questions."
There are four of these types of questions in a section, and one has 30 minutes to answer the section, which leaves something like 7.5 minutes to solve a problem like that. Some are more difficult than others.
The reason I don't think the LSAT produced any false positives OR negatives is because in order to do exceptionally well on the LSAT, you need to be smart. There's no way around it. One cannot hope to answer a multifaceted logic problem like the one set forth above in 7.5 minutes without being fairly intelligent. And in fact, not everybody does get them right, no matter HOW MUCH time they have (experience tutoring prelaw students), including myself - and i did failry well. By the same token, i don't think enormously smart people do poorly on the LSAT.
The same cannot be said of the MCAT. On the one hand, if you get a 38 on the MCAT, you are a ****ing smarty. There's no question about that. BUT, there might be several reasons why a smart person may NOT do well on the MCAT, including (most likely) a failure to prepare. Because the MCAT requires smarts and knowledge, a smart person can still do poorly if he has failed to acquire the knowledge tested on the exam. The LSAT is not like that. You don't need ANY outside knowledge to do well on the LSAT.
Judd