No matter how many checks, there's a human trial, and that may not go to plan either: http://news.bbc.co.uk/1/hi/england/london/4811626.stm
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Two men who fell seriously ill following a clinical drugs trial remain in a critical condition but four others are showing signs of improvement.
All six are still in intensive care in Northwick Park Hospital, north-west London, after falling ill on Monday.
TeGenero, which manufactures the anti-inflammatory drug, says it has apologised to the men's families.
All patients recovered, the final patient left hospital after 3 months. Not ideal. The company went bankrupt and the outcome was better regulation in the UK and Germany; great wiki article here: https://en.wikipedia.org/wiki/Theralizumab including the relevant: