Amberjack and Ivan, with all due respect: Do you see how your posts could be construed as "conspiracy theories" ? I mean, seriously now, do you *really* believe someone has come up with technology to tell aluminum apart from gold, yet :
"*They* don't want you to get this. Lest the hobby of detecting die a quick death. D/t all the gold quickly gets cherry picked out of junky parks"
Hence leading to lack of conventional machine sales, hence not profitable for the bottom line, hence they bury the technology. Right ? Did I understand you correctly ?
And there are cures (nutritional supplements, or whatever) for all the physical ills we face. However *they* don't want you to know. Because then we'd be seeing doctors less often. Hence less income for doctors. Hence they bury it. Right ? Did I understand you correctly ?
Well gee, what ever happened to the old "build a better mousetrap" saying ? If THAT is true, then the developer would be RUSHING to "get it to market" eh ?
I too have been md'ing since the mid '70s. And yes, the light-years advancements we saw in those years (mid '60s to mid '80s) is un-surpassed. But no, it's not a "conspiracy theory". It's because we are bumping into the laws of physics.