Sonny gets the nanites

Here is how Sonny get the nanites in Weekenders in I, Robot.

Computer voice: Unauthorized entry.

VIKI: I will not deactivate the security shield. Your actions are futile.

Sonny: Do you think that we are all made for a purpose? I do. [Observing his arm] Denser alloy. My father gave it to me. I think he wanted me to kill you.

[Sonny reaches through the security field and fills a vial of nanites. The plastic covering on his arm melts slightly, but the metal structure is unharmed as VIKI watches surprisedly. And the nanites are filled up]

VIKI: Security breached.