In short:
Outgoing US President Joe Biden has pardoned his son Hunter Biden, saying “raw politics … led to a miscarriage of justice”.
Hunter Biden was convicted of gun charges and tax evasion and was facing sentencing hearings scheduled for mid-December.
Joe Biden said he made the decision over the weekend while spending the Thanksgiving holiday with his family.
“nor shall any person be subject for the same offence to be twice put in jeopardy of life or limb;”
The double jeopardy clause doesn’t limit itself to only prohibiting second prosecutions. Once a case has been prosecuted to conclusion the defendant may not be made subject to the punishment again. A pardon terminating a punishment, would forestall recision as that would be once again subjecting the defendant for the same offensive.