Very true but it's usually just way more simple that that... meaning they are just completely bullshitting and they weren't natural and they aren't natural right now. Some of the guys in this thread... sure they could be natural... most of them just complete nonsense. Some guys have amazing genetics and my mate is one of them... looks crazy on 10mg mk-677 only. But most of these guys are just full of shit. The old ones who look great could be on very low doses now but they are still likely on test and hgh even if it's 250mg and 2iu per day.
Of course no one truly knows and some freaks will be natural but it makes me laugh when guys say I know him and he's definitely natural. I have had close mates lie to my face. I have seen a guy popping sdrol etc and thinking they were natural because you could buy it in a shop and it wasn't an injection. Even if you live with someone you don't know. How many guys on here hide their usage from their gf or wife and they don't have a clue. Yet guy's definitely know the guy they see 3 times per week in the gym is 100% natural because he doesn't have a clue.
Some of these natural guys should go on a small aas cycle because they would be Mr Olympia because they aren't far off using some celltech and a multi-vitamin.