Plagiarism is not acceptable anywhere, let alone in the workplace. In order to avoid trouble and make sure that your work is professional, you should be checking for plagiarism before submitting your tasks.
Not only can plagiarism affect your career, but it can also make you look bad in front of your colleagues. No matter what topic or area you could plagiarize in, you must (again) understand that this is not acceptable, and it will get you in trouble.
Just highlighting this again to make sure you got it. Holding yourself to a high standard is a must in the professional world.