As I explain you misunderstand the issue, I notice you have Ayn Rand in your sig. Coincidence?
The assests seized in drug law enforcement are much smaller than the costs. THere's just no conspiracy theory there.
Now, the 'gung ho righties for a period some years ago had expanded the seizure laws to be so aggressive that the police could keep assets whether or not the person was convicted, and it was a lengthy legal process to get them back for the innocent. This issue was usually referred to as 'forfeiture laws'. During this period, the police were seen a lot to increase drug enforcement because of the gain, and there were some bad examples of wrongdoing, such as a case where a property owner was targetted for a piece of land the police wanted, and was killed when the police entered for a search. IIRC, he was innocent.
The legal system is burdened by drug arrests. While it's 'jobs', it's also wasteful spending - not something like infrastructure or education. It's throwing money away.
Where you do see more pressure to throw that money away is anything that's privatized - the jails in this case. There are a lot of stories of private jail owners donating to politicians to get sentences increased.
We really don't need that corruption of our political system for people to spend longer time in jail at taxpayer expense than they otherwise would for the purpose of enriching the jail owner.