How does permafrost affect drilling and mining in far eastern Siberia?

Me what confession does hester make to dimmesdale while in the forest in chapter 17 of the scarlet letter ?

Drugs have a high potential for abuse. there is no routine therapeutic use for these drugs and they are not available for regular use. they may be obtained for “investigational use only” by applying to the u.s. drug enforcement agency. examples include heroin and lsd. which scheduled drug is this?

What does the author describe in this passage