Corinne Mitchell said she didn't want her son's conviction quashed by a new legal ruling as it would leave doubts over his innocence.
It comes after the Supreme Court ruled that interviewing suspects without a lawyer was a breach of human rights.
Scots law was quickly changed to reflect the decision and the court system is bracing itself for a flood of appeals.
When Mitchell was interviewed by police over the murder of his 14-year-old girlfriend Jodi Jones in 2003 he was alone.
His case is being investigated by the Scottish Criminal Cases Review Commission, which can now take the new ruling into account.
Mitchell's supporters say it could form a part of the SCCRC review but some, including his mother Corinne, are concerned.
She said: "Getting Luke out on a technicality would be disastrous.
"He'd never be able to lead a normal life and would spend every minute looking over his shoulder.
"Some will always believe he is guilty no matter what is put before them and technicality would just add fuel to the fire."