Why Removing Pesticides During the Extraction Process Is Important
Cannabis extracts are all the rage these days, from oils and wax, to budder and shatter.
he cannabis plant, however, is still classified as an illegal drug by the federal government. This makes it difficult for the Environmental Protection Agency to regulate pesticides contained in cannabis extracts. 
Not to worry though, because even the most contaminated cannabis extract can be purified.
Foreign matter and residual solvents can wreak havoc for cannabis consumers. One of the most common pesticides contained in cannabis is a hazardous fungicide called myclobutanil.
A toxic insecticide called imidacloprid has been labeled ‘moderately hazardous’ by the World Health Organization (WHO). 
Insecticides like abamectin and spiromesifen may also be present in some types of cannabis.
Are pesticides harmful to human health?
Pesticides will plague the bloodstream when contaminated cannabis is ingested or inhaled.
Evidence suggests that pesticide exposure could trigger neurological problems, fetal death, birth defects  and neurodevelopmental disorder. 
It is the responsibility of the Environmental Protection Agency to register labels that inform buyers countrywide of what they are consuming.
Why do cannabis concentrates pose a problem for pesticide contamination?
Hash oil concentrates pose a major concern for cannabis consumers. Pesticides and cannabinoids share alike chemical properties, therefore, when cannabis is being extracted, pesticides are concentrated along with the cannabinoids.
A 2015 study conducted by the Cannabis Safety Institute saw how concentrates can be 10x more potent in pesticides than the cannabis flower. 
In an attempt to make sure botanical products adhere to safety guidelines, American Herbal Pharmacopoeia (AHP) has issued a cannabis monograph. 
How can pesticides be removed during the cannabis extraction process?
Making a pesticide-free isolate or concentrate is significantly easier if you target the ideal compound you wish to extract, such as THC (tetrahydrocannabinol) or CBD (cannabidiol). Albeit economical, this option is not always possible.
This is where Flash Chromatography comes in handy. For decades, the chemical and pharmaceutical industries have relied on this pesticide removal technique. 
When an impurity is insoluble in a solvent that a desired compound has restricted solubility in, a Soxhlet extraction may be used. Nevertheless, Flash Chromatography is an effective way to de-toxify cannabis concentrates of pesticides, depending on the compound polarity.