One doesn't need a JD to join either agency, but there have been several interesting articles lately re. JDs who practiced and eventually decided to join the FBI (sorry, no info on CIA). The pay scale is a thorny issue; in fact, the FBI as a whole (not just post-JDs) is looking at possibly high attrition rates among new agents in the next few years b/c of their low starting salaries. Typical starting salary is mid- to high $40s, and promotions over the course of your career (approx. 20 yrs.) can take you up to $90,000. The problem, however, seems to lie in the fact that the FBI tends to place new agents in busy offices in large, expensive urban centers (e.g. NYC, Miami, LA), where home prices are extremely high. Check out jd2b.com for links to the articles.