Science can study law, and law schools generally accept both arts and sciences. The liberal arts and science are recorded separately at the time of admission, which does not affect the quota. In other words, liberal arts students will not compete with science students, and only science students will compete with science students. Compared with liberal arts, it is easier for science students to obtain law, because law majors are not popular in science applications.
Nowadays, a large part of people who work as lawyers are not law graduates. As long as you have a bachelor's degree, you can take the judicial examination and apply for the professional qualification of lawyers after passing it. But now, law firms all over the world tend to recruit lawyers with law books, because after all, people who have systematically passed the four-year college law education have better legal theory and thinking.