Can a runner have multiple copies of security testing in play and collect 2 credits from each copy for a successful run?

Thanks.

This is in the FAQ under Replacement Effects.

Replacement Effects

Replacement effects can only occur once per trigger. A replacement effect uses the word “instead”.

Example : The Runner cannot use two Bank Jobs during the same run. When the run is successful, the Runner may either access cards or use the ability of a Bank Job. Using Bank Job replaces accessing cards, so once the Runner triggers one of the Bank Jobs he cannot trigger the other.

That was my thought but I needed it confirming to convince my opponents.

Thanks.

You can still use multiple Security Testings in a turn, just not on the same server (nice if the Corp has undefended remotes, even better if you have Doppelganger). Alternatively, if at the start of turn you know you need to access multiple areas, just stick all your STs on a server you're not going to run