inviting people

[gman44]

I have invited about 16 people so far

Before I send out an invitation I look at the members list to see if they're on it and if they're not I send the invite. Shortly after that I look at the members who have joined and some of the people who I invited are there but in my profile it doesn't say confirmed. I realize its also possible that someone from here has already invited them or they joined on their own since I heard that you can join without an invite.

Isn't there a way when you enter the email of the person who you wish to invite the system would tell you if someone already invited them or entering their email in the search field to see if they are aboard already?