Answer:
a) Coca leaf chewing is part of the culture in Peru and is not associated with levels of toxicity and abuse associated with powdered cocaine
Step-by-step explanation:
Coca leaf chewing is often done in several countries in southamerica, including Peru, Equator, Bolivia and Chile, where the high altitude requieres them to chew Coca leaf in order to become more active, it´s like in america we drink coffee to wake up, it´s the same culture with coca leaf chewing in this countries, that is why he could have cocaine metabolites in his system, and that is why his uncle is not worried about it.