Why is Debra so poor and Dexter so rich?

Debras salary must be way higher than Dexters (sworn officers are way higher paid than lab staff, and she was even lieutenant for a while) and yet she despite being single and childfree she has to desperately fraud her landlord to afford a simple rental, meanwhile Dexter has multiple properties (even keeping an apartment just to keep his tools at), his own boat, children etc and can even buy a new car on impulse just to get close to a victim.