Originally Posted by
An Thropologist:
“Well not really. There were three of them involved in bringing the knickers to everyone's attention. Tiffiany erroneously excluded the other two from having been jointly responsible and placed the blame only on John. Then having eliminated two of the culprits from her enquiries and drawn her conclusions, she then declares she is going to carry out an enquiry. 
”
No she didn't. If there is a transcript available it should show that Tiffany asked who did it. Steph said that she thinks it was one of the boys. Tiffany asks who. Steph names the three boys involved. Then Tiffany asks her to narrow it down. Steph offers John's name.
It is only then that Tiffany said that it confirmed what she thought.
Christopher I'd count as innocent, as he said that they'd better get rid of them, but was stopped by John.
Darren hardly did anything.
It wasn't the laying them out on the table which was the problem. It was the laying them out and leaving them there for everyone to see which was.
John also made the point when the girls were mostly ignoring the red pants to bring direct attention to them by saying to them all "There's a pair of red panties I think you'll be interested in". Then the girls start getting all giddy about it. At which point John's expression was very telling.
Neither Christopher or Darren had any hand in that.