They do not have ports. I could have written my comment better as I meant not that the androids had ports that weren’t being used, but that androids are likely

They do not have ports. I could have written my comment better as I meant not that the androids had ports that weren’t being used, but that androids are likely to be designed with some port. So if testing like this was necessary, their design would have reflected a better way. Replicants were not accidental discoveries nor gifted by aliens, they were invented by Tyrell.