Miss Scarlett. The Reverened Green distinctly heard you tell the Professor that you had just, in your own words, 'made a joint in the bathroom'. You were seen, with the lead pipe in your hand, prowling the upper landing muttering 'must have a blow, must have a blow'. I put it to you that in your drug induced haze you do not recall hitting the poor Mrs Peacock over the head and leaving her in a pool of blood in the Conservatory. What is more... Oh, wait.

Sorry your honour, I have just received notification that Miss Scarlett is indeed a qualified plumber and had made a new lead joint on the burst lead pipe in the bathroom once she had located her blowlamp...

:D (tG)