subpoenable

adjective /səˈpinəbəl/

Capable of or permitted to be subpoenaed.

It has been astutely pointed out that: "As is often the case, the ultimate determination of what is discoverable under Rule 16 or subpoenable under Rule 17(c) depends upon the attitude that a district judge has about the nature of a criminal prosecution and the rights of both the Government and the defendant.