/// This injection can penetrate through thick clothing.
#define INJECT_CHECK_PENETRATE_THICK (1 << 0)

/// This injection bypasses species specific restrictions.
#define INJECT_CHECK_IGNORE_SPECIES (1 << 1)

/// When trying this injection, show an error message if it fails.
#define INJECT_TRY_SHOW_ERROR_MESSAGE (1 << 2)