Describe the crime associated with the cattle drives.

True blindness may be caused by trauma to the eye, severe conjunctivitis due to IBR (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin A deficiencies, rabies, vitamin B12 deficiency, neoplastic of the orbit or conjunctiva, cataracts, congenital malformations, etc.