[fl0ki]

It looks like I get to be the one to comment a classic criticism of RCT absolutism.

There have been no RCTs on parachutes or bulletproof vests. Volunteers welcome.

[pmyteh]

They found some volunteers and did the study! This is one of the classics from the Christmas BMJ: https://www.bmj.com/content/363/bmj.k5094

The study has... let's just say "other methodological problems". But they did do an RCT of parachute use! (The open peer review correspondence is quite fun, too).