He wanted to find out what local anesthetic was involved in each case.
A local anesthetic may be given, although sometimes it is not needed.
He'd not heard which of the local anesthetics Chris had used.
He did not have to search for the local anesthetics.
He'd been surprised by one piece of information about local anesthetics.
He is known for his research of local anesthetics, particularly cocaine.
A local anesthetic would be used to blunt the pain of the treatment itself.
"And you're sure they couldn't be caused by local anesthetics?"
That means a local anesthetic- and even so, it will hurt a fair amount.
Local anesthetic may bring almost instant relief for several hours.