Electronic signatures and real estate agreements

[Vince Greenland]

I am considering going paperless, which will offer so many advantages to me. However, in order to do it, leases and electronic sigatures is essential. I would like to get tenants to sign my lease on a tablet device with a stylus. My question is regarding its legality.
if the lease is ever contested and a tenant is smart enough to challenge the signature, would it hold up. Is there a way to minimize risks?
Is anyone out there currently doing this or some form of electronic signatures for leasing now?
Thanks for the help