I think even the laziest Investor would at least send someone to drive by the property to see the if meth is involved in this endeavor, but believe it or not there are a few sources that will keep records of properties where a drug lab ever existed.

Were starting Virtual assistance for real estate professionals Providing the administrative "brains" for a successful business If you're a contractor investor developer banker etc....

Were starting Virtual assistance for real estate professionals Providing the administrative "brains" for a successful business If you're a contractor investor developer banker etc....

This is the majority of the bookkeeping  -banks love it and you can do a P&L per class/property  Administration/overhead expenses can be prorated based on total income or time.

You get $30k from some random unacceptable source (friend who isn't family gifts it, drug money, Al Qaeda, sold a car or painting but didn't do any paperwork, you just walk into your bank with $30k cash and deposit it, it makes zero difference in the world, unacceptable is unacceptable).Your balance is $80k.You spend that $30k, doesn't matter on what.

California LLC's are a nightmare administratively and cost $800/year to the state.If you work with good counsel, you should have no significant risk of prohibited transactions, and the risk is exactly the same whether you write the checks or have a 3rd party custodian do so on behalf of your IRA. 

Drug abuse?

Compared to an IRA, Solo 401k contribution limits are roughly ten times higher.There is no custodial requirement for the 401k.You don't need the additional expense and administration of an LLC to have checkbook control.There is a built in-Roth component whereas IRAs are either traditional or Roth, not both.A spouse can also participate in the same Solo 401k plan.The Solo 401k has additional tax benefits over an IRA when investing into real estate using leverage.You can borrow from a 401k, but not an IRABoth C-Corps and LLCs can adopt a Solo 401k.

We suspect drug use, but obviously can't prove anything. 

The seller's attorney does not care where you get the money be it cash, financing or drug deal.