Start screen after sudo su to another user

Sudo'ing to a user then running screen doesn't work out of the box.  Typically you get the following error:

Cannot open your terminal '/dev/pts/1' - please check.

The solution:

sudo su - someuser

script /dev/null

screen

Source: http://dbadump.blogspot.com/2009/04/start-screen-after-sudo-su-to-another.html