The investigation must also determine whether both reports are accepted evidence. If one is reliable and the other rejected, the rejected report does not undermine the former's established force.
«لِأَنَّ الْقَوِيَّ لَا يُؤَثِّرُ فِيهِ مُخَالَفَةُ الضَّعِيفِ»
The opposition of a weak report does not affect a strong one.
This principle does not authorize declaring every inconvenient report weak. Both sets of chains and their possible defects must first be studied. Only after the counter-report has been shown to be inadmissible does it cease to present the special problem of two accepted, apparently conflicting reports.