why does my parking lights and brake lights stay on after I turn the car off on 2002 Buick LeSabre

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when I turn off my car and take the keys out the parking lights and brake lights stay on. does anyone have any suggestions on what might need to be fixed?
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i had it checked out. the mechanic seems to think its in the ignition switch. does that sound accurate. he changed the relay fuses but those were not bad. changed the headlight switch. that did not fix the problem. he also said it might be the body module. but he is leaning more toward the ignition switch.. thank you for your response. I appreciate any input I can get .
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