(My prior life entailed working as an Office Manager in a Substance Abuse Agency and Mental Health, so I know a great deal about "enablers)Some of my homes in the Inner City were in some rough neighborhoods.  

now im afraid to even use the washer/dryer.. what if they're like permanently contaminated with traces of this cystalline substance?

It is unconstitutional for local governments to pronounce leases virtually null and void by enacting rent and eviction moratoriums.With the Left it is always symbolism over substance, emotionalism and nothing is ever thought through thus leading to the dreaded unintentional consequences.

I think what makes someone a guru is more along the lines of selling primarily hype & fluff with little to no real substance.

I prefer to look at substance over form.  

This includes disorderly conduct, public urination, unlawful possession or use of a controlled substance and so on.

The City is asking our partners to extend and increase their support to provide immediate and long-term assistance, including: Washington State  Allocate additional resources for mental health and substance abuse disorder treatment;  Set Medicaid rates for inpatient treatment at an amount that is sufficient to provide effective treatment;  Identify state-owned property to host authorized encampments, vehicle parking, emergency shelter, and housing;  Allocate intervention and other resources to address the public health and safety crisis associated with unauthorized encampments on state property along I-5, I-90, and SR-99, including implementing physical changes to those areas to minimize ongoing and longterm public health and safety risks.  Increase the amount and expand allowable support services in the Consolidated Homeless Grant (CHG), including Housing and Essential Needs Program and stabilize funding for CHG;  Restore the Housing Trust Fund (HTF) to pre-recession levels; and  Authorize additional financing tools to expand affordable housing and ensure affordability and protections for tenants.

The tenant's dad is a contractor and the tenant offered to have his father look at it - but as you can imagine, I have can't trust the guy's judgement, as the father could just say "no damage" leaving me "holding the bag".Some areas of the floor and a velvet couch that was in the basement also seems to be growing this dense, white, spider-web like substance (mold?)

Thanks, Dmitriy - I still hold that your refutation in #1 has no substance.

There was a BP podcast a couple of years ago about an investor whose entire niche was specialty properties like this -- transition group homes for developmentally disabled adults,  or "clean living" homes for recovering substance abusers (I have a high school classmate who's lived in a home like this for several years).