Comment by nairboon

That's one of the issues that causes a bit of work. Citations would need to be judged with context. Let's say paper X is nowadays known to be tainted. If a tainted work is cited just for completeness, it's not an issue, e.g. "the method has been used in [a,b,c,d,x]" If the tainted work is cited critically, even better: e.g. "X claimed to show that..., but y and z could not replicate the results". But if it is just taken for granted at face value, then the taint-label should propagate: e.g. ".. has been previously proved by x and thus our results are very important...".