| Independent Scientist | Year of visit | Analysis of alleged 'gas' chambers attached to crematoriums (milligrams/kilogram of CN-) |
Analysis of 'Lice' treatment rooms (milligrams/kilogram of CN-) |
Number of samples taken |
| Fred
Leuchter Execution Expert |
1988 | 2.1 average | 1050 average | 5 |
| Germar Rudolf Chemist |
1991 | 3.6 average | 4190 average | 9 |
| John Ball Geologist |
1993 | 3.6 average | 2980 average | 3 |