In a single sentence, Card counting is legal everywhere.
A person cannot use any kind of devices that can assist a person in the card counting. But the pocket sized computers & the other electronic devices which are used for counting the cards are illegal everywhere. If a person is caught using such kind of devices they will be arrested at that time only in United States. A person who wished to count the cards is allowed only to use their own intellect for doing the same job.
The casinos are making the arrangements for appointing the guards for the card counters so0 that there is no cheating in counting the cards. They are watching for those players who are willing or playing the game in the same manner as that of the business views. They are looking for the players who do not interact with any of the dealer or the other patrons. They are looking for the players who are using basic strategies. They will count the cards with the suspect of the card counter. The player is labeled as the counter only when they see the player to raise their bet whenever the counts are in their favor.
