LOS ANGELES — Justin Bieber’s court cases on both sides of the U.S.-Canadian border could complicate the star’s jet-setting ways as his troubles bring more legal scrutiny.

Legal experts said a decision by Toronto authorities to charge the 19-year-old Bieber with assault on Wednesday makes his legal situation more complicated and difficult to untangle. He is already facing a driving under the influence case in Miami and remains under investigation for felony vandalism in California.