Earlier quoted context omitted.
The link you posted says that the original rat park researcher's own graduate student was unable to replicate the original experiment when he tried reducing the confounds. That seems like the most favorable possible situation for a replication to me. It also says that one confound was that morphine consumption wasn't measured in the same way between conditions in the original experiment. That seems pretty bad to me.…
Just saying, since neither humans nor rodents typically live in cages, maybe rodent experiments would be more predictive of human behavior if they weren't forced into living in small cages.
I must be in the control group. ;)