The singing voice for Wahlberg's character was provided by Steelheart frontman Miljenko Matijevic for the Steel Dragon Songs, the final number was dubbed by Brian Vander Ark. Jeff Scott Soto (of Talisman, Yngwie Malmsteen, Soul SirkUS, and Journey) provided the voice of the singer Wahlberg's character replaces. Kennedy is the only actor whose actual voice is used. . Ralph Saenz (Steel Panther) also appears briefly, as the singer auditioning ahead of Chris at the studio.
did mark wahlberg really sing in the movie rockstar?
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Answer: no

On-duty status determines LEOSA-eligibility. Thus, as long as the person meets the definition of ''qualified law enforcement officer'' in an on-duty capacity, whether an officer is a full-time, part-time, auxiliary, or reserve peace officer is not relevant in determining whether a person is a ''qualified law enforcement officer'' under LEOSA. LEOSA's definition of ''qualified law enforcement officer'' does not include a requirement that a person have law enforcement authority off-duty.
can an off duty cop carry a gun?
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Answer: yes

Card counting is not illegal under British law, nor is it under federal, state, or local laws in the United States provided that no external card counting device or person assists the player in counting cards. Still, casinos object to the practice, and try to prevent it, banning players believed to be counters. In their pursuit to identify card counters, casinos sometimes misidentify and ban players suspected of counting cards even if they do not.
is it illegal to count cards at a casino?
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Answer:
no