While many businesses are bouncing back from the BP oil spill, what's washing up on area beaches two years later may still represent the long term effects of the largest environmental disaster in U.S. history.

Geologists and university scientists have been regularly testing tarballs they've collected on area beaches. Through the use of forensic analysis testing, geologists say the tarballs they're finding are still being positively identified as originating from the BP oil spill.

While they say they're not trying to scare the public, they do want people to be aware that some of this oil product has tested positive for harmful carcinogens. Those who may be at higher risk include children, pregnant women, the elderly, and those with compromised immune systems.

" I'm surprised in certain areas where there's so much; I've always thought it will take many years til you won't see it at all" said investigative consultant Richard Brackin.

Some independent geologists and the clients they represent are now urging BP to address the issue, and want local officials to post health advisory signs to inform the public of the possible risk.