key, male, paid, chief, one, our, main, same, best, old native, female, secret, our, single, local, every police elderly, principal, government, primary, every another, potential knowledgeable anonymous, reliable, particular confidential, undercover

tells, told, claimed, says, named, said, who, put, gave, whose, went, did, may, does, states stated, noted, mentioned, added, data, also recalled, explained, reports, described, report interviews, interview reported, suggested interviewing, accuracy correlations, information

undercover policeconfidential information, interview, interviews, report, reports, relationship, questionnaire, file, data, survey, statementsquestionnaire surveys, survey, responses, concerning, data, regarding, revealed, indicated, asked, method, interview, technique, providesselection bias, interviewing, interview, interviews, methodfederal government, criminal, claimssecret police, key, agreement, informationsurvey questionnaire, revealed, data, responses, interviewing, indicated, report, reports, interviews, reported, concluded, method, interviewolder generation, woman, male, femaleanonymous questionnaire, surveys, interview, survey, interviews, citizen, accounts, woman, female, reports, reportworking undercover, relationship, groupspolice chief, undercover, reports, report, interviewselderly woman, female, male, chineseinformation regarding, concerning, provided, confidential, networks, networkstatements concerning, regarding, quoted, referredunnamed woman, female, individualmale female, bias, citizeninterviewing technique, potential, older, key, methodwhose sole, primary, principal, main, testimony, chieftestimony concerning, regarding, offered, revealed, indicatedlocal government, police, networks, network, groupswoman named, who, whose, whom, saith, commented, replied, speaks, recalls, knows, spoke, recalled, testified, remarked, came, citizen, thinksassessment questionnaire, report, interview, technique, ratings, reports, surveys, interviews, data, methodvaluable information, technique, testimony, dataevery citizen, single, individual, generation, woman, oneold woman, male, femalefile named, reportsunreliable testimony, data, method, information, networkreliable method, information, data, testimony, correlations, assessment, technique, reports, ratings, accounts, surveyswho knows, believes, testified, speaks, thinks, wrote, claimed, spoke, knew, believed, insisted, gave, came, took, advised, tells, givesunidentified male, woman, femaleprimary keyinterviews revealed, indicated, took, citedknowledgeable regarding, concerningcultural bias, groups, idealinterview questionnaire, survey, surveys, technique, responses, data, ratingsexcellent agreement, survey, coverage, reliability, selection, surveys, ratings, technique, correlations, methodbest describes, remembered, explained, method, described, explains, advised, expressed, approachcitizen groups, surveys, who, named, status, whosesurveys revealed, indicated, cited, reportedfurther testified, saith, information, stated, explains, adds, explained, testimony, commented, advised, suggestedreport concluded, questionnaire, stated, describes, noted, commented, concerning, indicated, cited, saysuseful information, technique, citizen, method, surveyreliability assessment, ratings, correlations, dataprovides valuable, excellent, information, coverage, useful, reliable, furtherobserved correlations, dataprovided valuable, excellentchinese government, cultural, citizenagreement concerning, regarding, concluded, provides, providedsingle file, individual, woman, generationarizona citizenfemale malereports concerning, indicated, regarding, cited, suggestedtechnique uses, described, provides, givestestified concerning, regardingmethod uses, described, provides, gives, addsstatus questionnaire, report, reports, groupswent inside, undercover, furtherdata file, concerning, regarding, networks, revealed, provided, reported, indicatedadds another, furtherindividual citizen, interviews, responses, accounts, who, believesclaims regarding, concerningone another, knows, thinks, recalls, believes, whoalso provides, testified, explains, recalls, referred, noted, commented, provided, adds, revealed, reported, gives, indicated, pointed, describes, suggested, wrote, claimed, observed, speaks, believes, advised, believed, makeslinguistic groups, survey, bias, approach, data, accuracypotential bias, usesnetwork reliability, file, coverageoldest male, generation, oldfelt assuredanother woman, method, approach, technique, unidentified, generation, unnamed, keymysterious woman, secret, unknown, femalecoverage provided, offeredideal citizen, woman, methodprincipal chief, usesknows bestapproach provides, usesaccuracy assessmentratings indicated, revealed, providedgroups whoseseemed assuredunknown primary, citizen, woman, reliabilitytrusted network, networksoffered valuablemay alsostates citizen, governmentresponses indicated, regardingnative claims, police, groupsreported correlationscorrelations reported, observed, indicated, revealedoriginal file, survey, data, questionnaire, agreementcriminal networks, policeheard testimonyspoke excellentgovernment reports, declared, believesgave testimonyparticular linguistic, cultural, individualchief namedmain groupsgives excellent, testimonynamed chieftook anotherspeaks excellentturned insideour relationship, oldest, interviewssame techniquecited anonymoussole methodadded another