Applied as a polysci major but have always had an interest in comp sci. If it turns out that I want to double major, would I get both a BS and BA?
Yes, It is possible. You can do your own dual degree program as long as it gets approved.
@rj15 a double major between CAS and SEAS is very feasible to do and has practically no administrative hurdles you have to overcome. All majors at CAS are open to SEAS students and vice versa.