Is in that a foolproof, failsafe randomized controlled trial?

Is in that a foolproof, failsafe randomized controlled trial?
Sure. Give everyone in the population you're studying a consecutive number, from 1 to howevermanythereare. Then write numbers from 1 to howevermanythereare on equal pieces of newspaper, and fold the pieces of paper so numbers can't be see. Place numbers in a bucket. Mix resourcefully. Randomly pick out pieces of paper, for as oodles samples as you want. The numbers you win determine which people from your population join in your trial.
The issues here is that. most feasible, not everyone in your population is predisposed to go through this process. Also, if you're studying ancestors, they may not be honest. It also helps to certify that your indication was indeed chosen at hit or miss. Independent reviewers of your procedure are great here. Also, if somebody else independently repeats your procedure, and gets like results, that helps too. You attain rid of the "unwilling participants" factor if you're studying objects rather than individuals.
In short, control evetything you can for best results.