Complete a background investigation. Must pass a polygraph test. Must pass a psychological evaluation and medical examination. Training is usually conducted at their own training academy and lasts between 15 - 30 weeks. Recruits usually have to stay on the facility during training.
Most academies conduct their training in a paramilitary fashion.
There is early morning physical conditioning classes, inspections, marching in formation, etc. Upon graduation, troopers are assigned a training officer to provide them with some on the job training. The starting salary varies with each state. The federal government employs a large number and a wide variety of police officers. There are over 75 federal agencies that have police officers.