A bit of old news and didn't see it posted but 'apparently' there's quite a bit of this that has been going on. This one seems to hit the headlines with the player getting suspended and the team doctor suspended from the medical council in the UK for cutting his lip afterwards with a scalpel to try and cover up the fake injury.
Starts at 0:30, analysis at 2:50 and you can see him reaching into his socks for the blood capsule and putting it in his mouth at 3:35
http://www.youtube.com/watch?v=-ppwVqvTipU
Quote:
The doctor at the centre of the “Bloodgate” scandal at Harlequins has been suspended from practising medicine pending further investigations into her conduct. Wendy Chapman, a hospital consultant, has been forbidden by the General Medical Council (GMC) from working as a doctor amid allegations that she deliberately cut the lip of Tom Williams, the Harlequins wing, with a scalpel in order to cover up his attempt to fake an injury using a capsule of red theatrical dye.
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http://www.timesonline.co.uk/tol/spo...cle6837584.ece
Not sure of the rules but it looks like some substitutions are specifically allowed for blood injuries.