Death/drug use on a property

[Long H.]

Potentially morbid albeit serious question(s), 

How does death of any kind (ie: illness, homicide, etc.) on a property affect it’s value? I understand that some states have or don’t have laws that require disclosure of death on a property.

Additionally, if a property was once the site of illicit drug use (ie: a meth house/lab) but is a good deal would it be worth the rehab?  

Lastly if the numbers work but there is a death/ drug use on the property… would you still buy it?