Simplify the following text for a Grade 14 native English-speaking person.
Original: Each of the states of Brazil has its own `` Civil Police Department '' , which carries out detective work , forensics and criminal investigation , acting as a state bureau of investigation , while the `` Military Police '' carries out preventive police duties .
Simplified: Each of the states of Brazil has its own `` Civil Police Department '' , which carries out detective work , forensics and criminal investigation , acting as a state bureau of investigation .