Because third-party fair trade certification companies can only reach so many products, one cannot rely on seeing a Fair Trade certified label on every "good" product. Things to look for:

• Single-source - look for chocolate that comes from one place. Central and South American countries are not known to have slave labor. TransFair USA has this fair trade map showing where fair trade certified producers are all over the world.
• Organic - companies that strive for organic, sustanibly grown chocolate would have a hard time finding it in a plantation using slave labor.
• Cooperative - cooperatives are plantations with fair labor practices. Look up the name of the cooperative mentioned and see its reputation online. Here is TransFair USA's list of fair trade producers.