Mama June: Is That a Skull in My Well?!! Video That Launched Probe

Cops have NO bones about it -- but TMZ just obtained the video that had construction workers thinking there was a skeleton in Mama June's well.

June bought the GA home as an investment, but as we reported ... workers with G & J Home Improvement thought they'd stumbled upon something fishy when they ripped up her bathroom floor.

This is the video they shot when they lowered a smartphone into the well. We'll say this -- it DOES look like there's something down there. Could be a rock, could be ... well, judge for yourself.