Off the top of my head, everything in the US and countries with strong labor/environmental laws gets a US certified "cruelty free" sticker with little checkboxes under it that state that no child labor, etc. was used. No one else gets to have a label unless they pay to have their entire supply chain certified on a yearly basis.

The absence of a label will be taken as the product did in fact use child labor, unsafe work environments, etc. just like the lack of an organic label is taken to mean that the farm uses pesticides when in fact, it could just be they couldn't afford certification.