No, there isn't enough oversight for top justice officials just as there isn't enough oversight for other government officials. Government officials get away with all kinds of thing for years and years, until somebody speaks out. It seems as if every year some government official gets either convicted or accused of something illegal. There has to be a way to make sure government officials are staying on the straight and narrow.
There is simply not enough oversight of top officials in government. No one is supposed to be above the law. Public officials that are found guilty of corruption should be held accountable like anyone else would be. Yes, this should even include prison time for crimes that warrant it. In short, in order for the public to have confidence in government, the public must have confidence in the people that run it.
No, there is not enough oversight of top justice officials. It is well known that power corrupts. Since Attorney Generals wield a significant amount of power in determining who to prosecute for what, it is necessary to subject them to increased scrutiny. There should be continuous oversight and regular audits carried out by independent investigators on Federal level.
The Pennsylvania Attorney General was found guilty of nine crimes including criminal conspiracy and perjury, but she still refuses to resign from office. When individuals are in a position of authority, they often get an inflated opinion of their own value and begin thinking they can do no wrong. They need a system of checks and balances.