An answer of "You cannot" seems odd to me though. Perl doesn't normally keep you from doing dangerous things, even though they are dangerous. While this is true, taint checking is something of a special case. When you turn on taint checking, you're specifically asking Perl to stop you from doing certain kinds of dangerous things. One of those dangerous things is to turn on tainting in the middle of your program--at that point it's essentially useless, because things that should have been tainted aren't! Hence, you're not allowed to turn on tainting in the middle of your program.
As the previous poster mentioned, you can use the ${^TAINT} variable to check if taint checking is turned on. (But as you implied, I'd recommend against doing so--there's nothing you should do when -T is on that you shouldn't also do with it off.)
=cut
--Brent Dax
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