Where all the work is done under the menace of a penalty or the person has not offered himself voluntarily and is now unable to leave. They may experience:
Threat or actual physical harm
Restriction of movement or confinement
Debt bondage i.e. working to pay off a debt or loan, often the victim is paid very little or nothing at all for their services because of deductions
Withholding of pay or excessive reductions
Withholding of documents e.g. passport/security card
Threat of revealing to authorities an irregular immigration status
Their employer is unable to produce documents required
Poor or non-existent health and safety standards
Requirement to pay for tools and food
Imposed place of accommodation (and deductions made for it)