Summary

Portrait of Noah Haynes Swayne Noah Haynes Swayne Coppell v. Hall — Opinion of the Court

The stipulations in the contract as to everything Coppell was to do in the rebel territory was contrary to public policy, to the law of nations, to the act of Congress, to the proclamation of the President, and to the regulations of the Treasury Department.
The protection to be given, if effectual, might have deprived the United States of pecuniary means to the extent of the value of the cotton. Withholding from one scale affects the result as much as putting into the other.
Source: Wikisource

Portrait of Noah Haynes Swayne Noah Haynes Swayne Coppell v. Hall — Opinion of the Court

It was doubtless expected that the insurgent authorities and the insurgent population would respect the rights of the 'British subject.' If the surging tide of war should sweep back the rebel arms, and the national forces should penetrate to the localities of the cotton, the custodian would be ready, in every instance, to produce the consular certificate.
Source: Wikisource

Portrait of Noah Haynes Swayne Noah Haynes Swayne Coppell v. Hall — Opinion of the Court

The instruction given to the jury, that if the contract was illegal the illegality had been waived by the reconventional demand of the defendants, was founded upon a misconception of the law. In such cases there can be no waiver. The defence is allowed, not for the sake of the defendant, but of the law itself. The principle is indispensable to the purity of its administration. It will not enforce what it has forbidden and denounced. The maxim, ex dolo malo non oritur actio, is limited by no such qualification. The proposition to the contrary strikes us as hardly worthy of serious refutation.
Source: Wikisource

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