There are some peanuts that harbor aflatoxins.
Aflatoxin is produced by the mold Aspergillus flavus, and can occur in nuts, legumes, seeds, corn, wheat and other crops. Extreme heat and drought before harvest, as well as moist, humid storage conditions, increase susceptibility.
However, if you find a reputable source that test their products you should be fine.
We leave out peanuts in most of our recipes (however we do have some with peanut butter) simply due to the large amount of peanut allergies.