[yarddog]

I can tell an illegal alien at a glance. Can you? /sarcasm

Put 10 people in a line up. Have them selected at random from a phone book. Have one of them be an illegal alien, also selected at random from.

I bet I could pick him out maybe 90% of the time.

[coconutt2000]

Let me pick the lineup from a collection of randomly selected legal and illegal immigrants.

And none of them have to be illegal.

Then you choose.