This is not true at all. The rule of law, within the confines of the judicial system, does NOT define truth. The system weighs evidence and determines whether the preponderance of evidence indicates guilt beyond a reasonable doubt.
Someone could murder someone, but due to lack of evidence they are found “not guilty”. But that’s not the same as “the truth is this person did not commit murder”. It’s simply a finding that the state didn’t prove its case.
> The system weighs evidence and determines whether the preponderance of evidence
A formal process of examining evidence marshaled in the service of arguments supporting/refuting a claim sounds practically equivalent to most forms of determining truth. Because it is.
Not only that, but there are segments of the law where truth is explicitly invoked, ie "truth is an absolute defense against defamation."
Someone could murder someone, but due to lack of evidence they are found “not guilty”. But that’s not the same as “the truth is this person did not commit murder”. It’s simply a finding that the state didn’t prove its case.