is there a way to validate outgoing database links are encrypted?

I know you can verify if an incoming connection to a DB is encrypted by running code like this:select * from v$session_connect_info where sid = &1;

Is there a way to verify an outgoing DB link connection?  Tracing all connections where the DB is acting as the client is practical.  Also, I'm not the DBA for all the remote DBs, so I can't simply test the connection from the remote side.

I'm mostly concerned with 10g, but 11g only solutions are also welcome.

Thanks