One person was arrested after a head-on crash injured four people in Martin County on Wednesday afternoon. According to police, 34-year-old Valerie McCarthy of Shoals crashed into a vehicle being driven by 48-year-old Kevin Scott Hert, Sr., also of Shoals. Three passengers in Hert’s vehicle were hurt, including two children. McCarthy had two children in her car, with one of them suffering a neck injury. McCarthy tested positive for numerous types of drugs in her system, and is facing several charges.