The point is not to admit liars. They genuinely don't want stoners in the service. Now, you can argue till you are blue in the face that you will simply get mo

The point is not to admit liars. They genuinely don't want stoners in the service. Now, you can argue till you are blue in the face that you will simply get more dishonest members, and this greatly outweighs the benefits of throwing out a few occasional users. But, ultimately speaking, these admission conditions are designed by committees, and there's always someone on the committee who doesn't want stoners at any cost.