Conversation so far:
Did Sanjay Dutt star in any major films in 2007?
CANNOTANSWER.
Did Sanjay Dutt act in any films between 2007 and 2009?
CANNOTANSWER.
What did Sanjay Dutt do between 2007 and 2009?
On 31 July 2007, the TADA court sentenced Dutt to six years' rigorous imprisonment for illegal possession of weapons.
Did he serve his entire sentence?
Dutt appealed against the sentence and was granted interim bail on 20 August 2007.
Did he make any comments about the case?
On 22 October 2007 Dutt was back in jail but again applied for bail.
Is anything else interesting about the article?
On 21 March 2013 the Supreme Court upheld the verdict of the TADA court but shortened the sentence to five years' imprisonment.

Question: Why was he in illegal possession of weapons?
Self-contained rewrite: Why was Sanjay Dutt in illegal possession of weapons?