Study what is of interest to you.
I think that it is poor advice to suggest that one should prepare for law school by taking an easy major in order to earn a high GPA. Lack of a challenging curriculum is likely to be reflected in one’s LSAT score. THe LSAT is the single most important admissions factor for law school.
I do agree that criminal justice is a poor major for one intending to go to law school. Criminal justice majors tend to perform the worst among many majors on the LSAT exam.