[JLS]

Your #3 only partially matches my opinion of what happened, therefore I chose none of your options.

Are you still claiming Mangum was mailed to the state crime lab and they inspected her? Give it up.

[ltc8k6]

The SBI lab didn't have CGM's DNA for comparison?

They were looking for her DNA on items taken from the bathroom as well.

They must have had a little bit of CGM in the lab.