When are you sure that you are facing a bad shuffling?
During the shoe?During the shuffling itself?
It's depends on the permanence or on the lazy croupier?
Almost every shoe dealt is bad shuffled, unfortunately this feature won't get the player any help in many instances.
Thus it's not how bad is shuffled an entire shoe that matters, instead it's how bad a shoe is shuffled in some portions of the deck.
Itlr bac outcomes are strictly related to the actual distribution of key cards, falling here or there yet forming some more or less likely sequences.
Obviously nothing is more likely than the counterpart unless a strong unrandomness went in place (of course this may happen even into a perfect random environment coincidentally).
At any rate, the shuffling moves made by a live dealer or a CSM working on the same deck will produce the best opportunities to catch the situations where unrandomness will reign.
Notice that 100% of the CSM decks are dealt alternatively (meaning that two different entire decks are shuffled each time).
Of course where a CSM isn't working, it's virtually impossible that a live dealer will shuffle the cards in a perfect random fashion.
At HS tables (where most money is collected by casinos), decks are presented pre-shuffled and slight manually shuffled after, therefore the situation is more unclear.
Should players fear a close to a perfect random shuffle?
Unless cards are arranged by a software, perfect randomness will get no place into an 8-deck shoe.
The casinos' fortune is because players want to win too much in the wrong place or to win per every shoe dealt, an impossible task by any means.
That means that whether we're properly selecting the playable shoes and the favourable spots, baccarat is 1 trillion percent beatable scientifically by a close to 0% probability error.
Just as decks are not perfectly shuffled.