xt otherwise requires, “prohibited substance” has the meaning ascribed to it in NRS 484.1245. (Added to NRS by 1999, 3400) NRS 50.265 Opinions: Lay witnesses. If the witness is not testifying as an expert, his testimony in the form of opinions or inferences is limited to those opinions or inferences which are: 1. Rationally based on the perception of the witness; and 2. Helpful to a clear understanding of his testimony or the determination of a fact in issue. (Added to NRS by 1971, 793) NRS 50.275 Testimony by experts. If scientific, technical or other specialized knowledge will assist the trier of fact to understand the evidence or to determine a fact in issue, a witness qualified as an expert by special knowledge, skill, experience, training or education may testify to matters within the scope of such knowledge. (Added to NRS by 1971, 793) NRS 50.285 Opinions: Experts. 1. The facts or data in the particular case upon which an expert bases an opinion or inference may be those perceived by or made known to him at or before the hearing. 2. If of a type reasonably relied upon by experts in forming opinions or inferences upon the subject, the facts or data need not be admissible in evidence. (Added to NRS by 1971, 793) NRS 50.295 Opinions: Ultimate issues. Testimony in the form of an opinion or inference otherwise admissible is not objectionable because it embraces an ultimate issue to be decided by the trier of fact. (Added to NRS by 1971, 793) NRS 50.305 Disclosure of facts and data underlying expert opinion. The expert may testify in terms of opinion or inference and give his reasons therefor without prior disclosure of the underlying facts or data, unless the judge requires otherwise. The expert may in any event be required to disclose the underlying facts or data on cross-examination. (Added to NRS by 1971, 793) NRS 50.310 Admissibility of affidavit or declaration of laboratory director regarding results of test performed by medical laboratory. 1. The affidavit or declaration of a laboratory director who has qualified in the district court of any county as an expert witness to testify regarding the results of a test of a medical laboratory is admissible in evidence in any civil, criminal or administrative proceeding to prove: (a) That the affiant or declarant is a laboratory director. (b) The results of a test that the medical laboratory is licensed to conduct and which is conducted by the medical laboratory of which the affiant or declarant is the laboratory director. The affidavit or declaration must contain the evidentiary foundation upon which the results of the test are based, including the description of the test, the personnel involved and the controls employed in conducting the test. 2. As used in this section: (a) “Laboratory director” has the meaning ascribed to it in NRS 652.050. (b) “Medical laboratory” has the meaning ascribed to it in NRS 652.060. (Added to NRS by 1993, 248; A 1997, 1418) NRS 50.315 Admissibility of affidavit or declaration offered to prove certain facts concerning use of certain devices or withdrawal or holding of evidence related to determining presence of alcohol, controlled substance, chemical, poison, organic solvent or another prohibited substance. 1. The affidavit or declaration of a person is admissible in evidence in any grand jury hearing, preliminary hearing or administrative proceeding to prove: (a) That the affiant or declarant has been certified by the Director of the Department of Public Safety as being competent to operate devices of a type certified by the Committee on Testing for Intoxication as accurate and reliable for testing a person’s breath to determine the concentration of alcohol in his breath; (b) The identity of a person from whom the affiant or declarant obtained a sample of breath; and (c) That the affiant or declarant tested the sample using a device of a type so certified and that the device was functioning properly. 2. The affidavit or declaration of a person who prepared a chemical solution or gas that has been used in calibrating a device for testing another’s breath to determine the concentration of alcohol in his breath is admissible in evidence in any grand jury hearing, preliminary hearing or administrative proceeding to prove: (a) The occupation of the affiant or declarant; and (b) That the solution or gas has the chemical composition necessary for accurately calibrating it. 3. The affidavit or declaration of a person who calibrates a device for testing another’s breath to determine the concentration of alcohol in his breath is admissible in evidence in any grand jury hearing, preliminary hearing or administrative proceeding to prove: (a) The occupation of the affiant or declarant; (b) That on a specified date the affiant or declarant calibrated the device at a named law enforcement agency by using the procedures and equipment prescribed in the regulations of the Committee on Testing for Intoxication; (c) That the calibration was performed within the period required by the Committee’s regulations; and (d) Upon completing the calibration of the device, it was operating properly. 4. The affidavit or declaration made under the penalty of perjury of a person who withdraws a sample of blood from another for analysis by an expert as set forth in NRS 50.320 is admissible in any grand jury hearing, preliminary hearing or administrative proceeding to prove: (a) The occupation of the affiant or declarant; (b) The identity of the person from whom the affiant or declarant withdrew the sample; (c) The fact that the affiant or declarant kept the sample in his sole custody or control and in substantially the same condition as when he first obtained it until delivering it to another; and (d) The identity of the person to whom the affiant or declarant delivered it. 5. The affidavit or declaration of a person who receives from another a sample of blood or urine or other tangible evidence that is alleged to contain alcohol or a controlled substance, chemical, poison, organic solvent or another prohibited substance may be admitted in any grand jury hearing, preliminary hearing or civil or administrative proceeding to prove: (a) The occupation of the affiant or declarant; (b) The fact that the affiant or declarant received a sample or other evidence from another person and kept it in his sole custody or control in substantially the same condition as when he first received it until delivering it to another; and (c) The identity of the person to whom the affiant or declarant delivered it. 6. The Committee on Testing for Intoxication shall adopt regulations prescribing the form of the affidavits and declarations described in this section. (Added to NRS by 1971, 929, 2048; A 1973, 891; 1975, 647; 1983, 1084, 1914; 1985, 1972; 1987, 798, 1544, 1579; 1989, 77; 1993, 84, 2079; 1995, 2712; 1997, 1419; 1999, 2468, 3400; 2001, 172, 2555; 2005, 2044) NRS 50.320 Admissibility of affidavit or declaration of chemist or other expert witness regarding presence in breath, blood or urine of alcohol, controlled substance, chemical, poison, organic solvent or another prohibited substance or regarding identity or quantity of controlled substance possessed. 1. The affidavit or declaration of a chemist and any other person who has qualified in the district court of any county to testify as an expert witness regarding the presence in the breath, blood or urine of a person of alcohol, a controlled substance, or a chemical, poison, organic solvent or another prohibited substance, or the identity or quantity of a controlled substance alleged to have been in the possession of a person, which is submitted to prove: (a) The quantity of the purpo

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