Determining Number and Sex Of Children

During a lull at the courthouse today, someone proclaimed that a pregnancy test (described above) has been 100% accurate. It's the craziest thing I've ever heard, but he/she/it said it had been foolproof every time it had been used.

I then asked the person if a pentagram was involved.

Look out if you go up to the courthouse, I think we've got some Deviltry going on.