You mistakenly cooked chicken breasts in crockpot for 8 hrs on Warm instead of Low Is it safe to now cook couple high after only being warm all day?

The USDA recommends that chicken be cooked to an internal temperature of 165 degrees Fahrenheit to kill harmful bacteria. According to the USDA:

> At temperatures below 40 °F, bacteria grow very slowly and food will remain safe longer while above 140 °F, bacteria grow rapidly and the risk of foodborne illness increases.

Since the chicken breasts were sitting in the crockpot for 8 hours on warm, they were likely in the temperature danger zone for bacteria growth, which is between 40 and 140 degrees Fahrenheit. This means that harmful bacteria could have multiplied to dangerous levels, and cooking the chicken on high will not be sufficient to kill all of the bacteria.

To be safe, the chicken breasts should be discarded.