That depends on the model of tap that you use and how it is configured. If you are using a truly passive tap, such as a fiber tap the answer is no. Gigabit capable copper taps that are configurable can be set up by the user to allow bi-directional traffic back onto the link. The monitoring tool will be visible only if the tap has a Bi-directional traffic path intentionally configured to allow this.  The default configuration of these taps has bidirectional traffic disabled by default for security reasons. It can be changed only by an administrator logged in via Superuser mode.