ENHANCING THE VALIDITY OF SELF-REPORTED ALCOHOL AND MARIJUANA CONSUMPTION USING A BOGUS PIPELINE PROCEDURE - A METAANALYTIC REVIEW

Two separate meta-analyses were conducted to test whether the use of s elf-report measures within the bogus pipeline (BPL) paradigm yields mo re valid responses than the use of self-report measures alone for asse ssing alcohol and marijuana consumption. Weighted mean effect sizes (d s) of 0.01 and -0.12 were obtained for studies using alcohol and marij uana self-reports, respectively. Chi-square tests based on Ns of 1,892 for the alcohol sample and 1,425 for the marijuana sample indicated h omogeneity of effect sizes for both data bases. Explanations for why a BPL procedure does not improve the validity of self-reported alcohol and marijuana consumption are provided. In addition, alternative metho ds that may enhance the validity of alcohol and marijuana self-reports are discussed.