For fear of appearing too lenient, or for fear of appearing as if they might be pulling a sample early “to make it pass”, many companies shy away from early pulls altogether. I’ve heard of several that do pull early, and the key is that whatever they do is specifically described in a procedure. That said, the expiry interval and the final interval should always be pulled on or after the date. For other pulls, I’ve heard of companies pulling up to 2 weeks early, though I’d recommend that be only for later (> 1 year?) pulls.