I just read a recent report from treehugger.com, discussing ways to avoid BPA in receipts.
The Environmental Working Group recently reported on the issue.
The report indicates BPA is found in carbon-less copy paper and thermal paper.

BPA, or Bisphenol-A, is an endocrine disruptor, or a substance that acts like the hormones of the endocrine system and disrupts their normal function.

“Do not recycle receipts and other thermal paper. BPA residues from receipts will contaminate recycled paper.
If you are unsure, check whether paper is thermally treated by rubbing it with a coin. Thermal paper discolors with the friction; conventional paper does not.”

see: http://www.treehugger.com/files/2010/07/bpa-in-receipts.php