Can anybody give a polygraph test?

No. It is unlawful for any person, including a city, county, or state employee, to administer polygraph examinations or represent to be a polygraph examiner without holding a valid polygraph examiner license issued by the Commission. It is unlawful for any person, other than a law enforcement officer acting in accordance with TCA § 62-27-103(c), to operate any instrument or device to detect deception or verify the truth of statements that does not meet the minimum instrumentation requirements set forth in TCA § 62-27-103(a), or to use any title or make any representation tending to indicate that such person is qualified to detect deception or verify truth of statements through the use of such instrument or device.