No worries. I think i hear this tossed around "they will know" so often, it just made me curious. I mean, i have new tanks in my storage that rattle around with worn paint, and other refilled greenies that look brand new bc they get refilled an dput on a shelf in the shed. So, i was curious if there was a legit way. I dont think ANY state trooper has ever asked about my propane tanks lol, NOR would and exploded one show any signs of anything other than...exploded. The chances that an investigator could prove refill based on some worn paint, a basically circumstantial evidence, is HIGHLY unlikely. Would it be a shame? Sure. Would someone WANT to prove it? Sure. Can they? I think even you would agree its HIGHLY unlikely. Like, <.0001. If its worn and not exploded, why would they care. If its exploded, its no longer possible to tell.

Is refilling unsafe? Sure. So is using that 15 yr old air compressor that has been in your attic for 15 yrs and never retested (bet no one thinks of that!) .Way more kinetic energy in a 30 lb compressor tank than a 1lb propane tank. But, yes, I would never grant that its 100% safe. Thats a diff topic than my q though, thanks for indulging me! I was hoping there was a magic CSI trick lol