The Cannabis industry is fast growing and ever changing. Everyone in the industry faces challenges and the most burdensome of all is passing your Compliance test. Compliance tests are conducted differently state to state but all states require some form of Microbial testing.
Having a batch fail for Aspergillus does not mean that you did anything wrong when growing your cannabis. Aspergillus and humans share the same environment, so it is very likely that you interact with and even breath aspergillus spores every day. If you are growing outside, then preventing aspergillus can be nearly impossible and based mostly on luck.