MADISON, Wis. (AP) -- Gov. Scott Walker has signed a bill requiring Wisconsin police departments to use outside investigators to probe officer-involved deaths.

The bill comes in the wake of several high-profile officer involved deaths across the state in recent years. Supporters say it will alleviate concerns about investigators from the same department covering up their friends' misconduct.

Currently smaller departments routinely rely on outside agencies to investigate officer-involved deaths. But the state's biggest departments, Green Bay, Madison and Milwaukee, investigate their own officers.

- Gov. Walker also has signed a bill that requires out-of-state sex offenders to register if they move into Wisconsin.

The bipartisan measure requires out-of-state sex offenders to register with the Wisconsin Department of Corrections if they become a Wisconsin resident, become employed here or become a student here. The proposal allows the agency to notify local law enforcement of the offenders' presence.

- Wisconsin police could not track cellphone locations without a warrant under a bill Gov. Scott Walker has signed into law.

The measure Walker signed Wednesday passed the Legislature in February with no opposition.

Under the new law, police would have to present details about their investigation when seeking a warrant to track a cellphone. That includes the phone's owners or whoever is possessing it, the subject of the investigation, a statement of the crime and a statement of probable cause about how tracking the cellphone is related to criminal activity.

- It will soon be three times more costly for drivers to park illegally in a disability parking spot in Wisconsin.

The new law will increase minimum fines from $50 to $150. The current maximum penalty of $300 won't change.

The law also creates a fine for building owners to not provide enough disability parking spaces on site. Building owners or occupants with at least 26 parking spaces must reserve disabled parking spaces or pay between $150 and $300.

-Gov. Scott Walker has signed a bill that tightens Wisconsin's human trafficking laws and gives victims a way to void any crimes they may have committed.

Current Wisconsin law defines trafficking as recruiting, enticing, harboring or transporting someone against their consent. The bipartisan bill removes the consent element and adds using schemes to control an individual to the definition.

The measure allows trafficking victims to ask a judge to vacate or expunge prostitution convictions. The judge could grant the request if he or she gives the prosecutor a chance to respond and determines society won't be harmed