Since you haven't posted any kind of code context and/or error message, it might be a complete miss, but -T switch can issue an error like 'Too late to use -T', especially if you use this option on a poorly configured web-server (IIS for example).

This issue can be solved by explicitly including the -T switch on the application mapping in IIS. You should then name your script with an extension like '.Tpl' and map this extension to '<path_to_perl>/perl.exe -T'. All the scripts with the extension '.tpl' will then have the Taint check enabled.

<kbd>--
PerlMonger::Paris(http => 'paris.pm.org');</kbd>